Title of Invention	"A TYRE WITH RADICAL CARCASS REINFORCEMENT"
Abstract	A tyre with radial carcass reinforcement (1), having a crown reinforcement (3) comprising at least two working crown plies (32, 34) made of inextensible cables, crossed from one ply to the other and forming angles of between 10° and 45° with the circumferential direction, characterised in that in the absence of any ply formed of inextensible cables forming an angle greater than 45° with the circumferential direction, an additional, axially continuous, ply (33) formed of metallic elements oriented substantially parallel to the circumferential direction, is placed radially between the working plies (32, 34), having an axial width L33 at least equal to 1.05 times the axial width of the widest working crown ply L32, L34.

Title of Invention

"A TYRE WITH RADICAL CARCASS REINFORCEMENT"

Abstract

A tyre with radial carcass reinforcement (1), having a crown reinforcement (3) comprising at least two working crown plies (32, 34) made of inextensible cables, crossed from one ply to the other and forming angles of between 10° and 45° with the circumferential direction, characterised in that in the absence of any ply formed of inextensible cables forming an angle greater than 45° with the circumferential direction, an additional, axially continuous, ply (33) formed of metallic elements oriented substantially parallel to the circumferential direction, is placed radially between the working plies (32, 34), having an axial width L33 at least equal to 1.05 times the axial width of the widest working crown ply L32, L34.

Full Text	The present invention relates to a tyre with radical carcass reinforcement. The invention relates to a tyre with radial carcass reinforcement anchored in each bead to at least one bead wire, and comprising a crown reinforcement formed by at least two so-called working plies, superposed and made of wires or cables which are parallel to each other in each ply and are crossed from one ply to the other, forming angles of at most 45° in absolute value with the circumferential direction of the tyre. French Application FR 94/15 736, which has not hitherto been published, relates to a tyre as described above, and more particularly to a "heavy goods vehicle"-type tyre, the ratio of the height above rim H to the maximum axial width S of which is at most 0.60. Said application, in order to improve the life of the crown reinforcement of such a tyre, and also the regularity of wear of the tread thereof, requires an architecture of the crown reinforcement characterised by the combined presence in said reinforcement of an axially continuous ply formed of inextensible cables forming an angle of at least 60° with the circumferential direction of the tyre, and a ply of metallic elements oriented substantially parallel to the circumferential direction, arranged radially between the two working crown plies. The object of such an architecture is to reduce the operating temperatures prevailing at the edges of the working plies, the width of the additional ply of circumferential cables being less than the widths of the working plies. Since the reduction of the operating temperatures in tyres is also a major concern of the manufacturers of "heavy goods vehicle" tyres, whatever the H/S form ratio, the Applicants' has led them to look for a solution which is both effective and economic. Accordingly, there is provided a tyre with a radial carcass reinforcement, haying a crown reinforcement comprising at least two working crown plies at inextensible cables, crossed from one ply to the next, forming angles of between 10° and 45° with the circumferential direction, and in the absence of any ply formed of inextensible cables forming an angle greater than 45° with the circumferential direction, an additional, axially continuous, ply formed of metallic elements oriented substantially parallel to the circumferential direction, placed radially between the working plies, having an axial width L33 of 50% of the maximum axial width So of the carcass reinforcement, characterized in that the width L33 of the additional ply is at least equal to 1.05 times the axial width of the widest working crown ply L32, L34, the cables of said additional ply having a larger diameter than that of the cables of the working plies. Preferably, the additional ply will have an axial width at least equal to 1.1 times the width of the widest working crown ply. It has been noted that not only does the arrangement set forth and claimed permit a substantial gain in terms of operating temperature without requiring a so-called triangulation ply, but furthermore, unexpectedly, it permits an increase in the safety factor of a cable being the ratio of its breaking force under tension to the maximum tensile force to which it is subjected during operation in the travelling tyre. At a constant safety factor, the weight and the cost of the additional ply can be advantageously reduced. One advantageous manner of using the additional ply of circumferential elements, which is more particularly suitable for tyres of H/S shape ratio of at least 0.70, consists in imparting to the first working crown ply a meridian curvature substantially equal to the meridian curvature of the subjacent carcass reinforcement, so as to be able to arrange it parallel to said carcass reinforcement without the interposition of profiled members. The additional ply is then provided with a substantially zero curvature, being separated from the first working ply by suitable profiled members, of substantially triangular shape. "Inextensible cable" is to be understood to mean a cable, for instance a steel cable, which has a relative elongation of less than 0.5% measured at 25% of its breaking load. Metallic elements oriented substantially parallel to the circumferential direction are elements which form angles within the range of +2.5°, -2.5° around 0° with said direction. The reinforcement elements of the additional ply may be inextensible metal cables imparting to said ply a very high rigidity of extension under tensile stress from the low elongations onwards. The rigidity of extension of the additional ply may be between 0.3 and 1.3 times the rigidity per unit length of a working ply of the crown reinforcement. The rigidity of extension of a ply of reinforcing elements results from the tensile force exerted in the direction of said elements per unit of width of ply which is necessary to obtain a given relative elongation ε, and may be expressed by the formula R = 1/p . dF/dε, R being the rigidity of the ply in question, p the pitch between elements of said ply, dF/de the derivative of the tensile force relative to the relative elongation, and e being equal to 0.5%. In the above context, the additional ply may be formed of so-called semi-elastic continuous steel cables, that is to say cables having relative elongations upon rupture of between 2% and 6%. These cables make it possible to obtain the level of rigidity suitable for proper distribution of the circumferential tension between the working crown plies and the additional ply. Said cables are advantageously said to be "bimodular", that is to say, having a curve of tensile stress as a function of relative elongation having gradual slopes for the low elongations and a substantially constant, steep slope for the higher elongations. The very low modulus before curing for elongations of less than 2% permits an increase in the circumferential development of the additional ply during the curing of the tyre. The additional ply may also be formed of metal cables made of steel, oriented circumferentially and cut so as to form sections of a length very much less than the circumferential length of the ply, the cuts between sections being circumferentially offset relative to each other. Such an embodiment makes it possible, in simple manner, to impart the desired rigidity to the additional ply, said rigidity being less than the rigidity of a ply made with the same non-divided cables. Preferably, the cables used in the additional ply will have a larger diameter than that of the cables used in the working ply. The crown reinforcement according to the invention will advantageously be finished off by a so-called protective crown ply, formed of elastic metal cables made of steel, oriented relative to the circumferential direction at an angle substantially equal to the angle formed by the cables of the radially outermost working crown ply, and the axial width of which is at least equal to the axial width of the radially outermost working ply. The characteristics and advantages of the invention will be better understood with reference to the following description, which refers to the drawing, illustrating in non-limitative manner an example of embodiment, and in which the single figure 1 shows a diagram, viewed in meridian section, of a crown reinforcement according to the invention. The tyre P, of dimension 315/80 R 22.5 X, has an H/S form ratio of 0.8, H being the height of the tyre P on its mounting rim and S its maximum axial width. Said tyre P comprises a radial carcass reinforcement (1) anchored in each bead to at least one bead wire, forming an upturn, and formed by a single ply of metal cables. This carcass reinforcement (1) is hooped by a crown reinforcement (3), formed radially from the inside to the outside by a first working crown ply (32) formed of inextensible metal cables made of steel and oriented by an angle a, equal in the case illustrated to 22°, radially adjacent and parallel to the carcass reinforcement (1), its meridian curvature 1/r being substantially equal to the meridian curvature l/r1 of the subjacent carcass reinforcement (1), the cables respectively of the carcass ply and of the working ply being separated by a constant thickness of rubber mix, surmounting the first working crown ply (32), by an additional ply (33) formed of inextensible metallic elements made of steel, of a circumferential length substantially equal to 1/6 of the circumferential length of the ply (33), said elements being oriented at 0°, the axially outer edges of the first working crown ply being separated from the additional ply (33) of circumferential elements by profiled members (4) of substantially triangular cross-section, the thickness e2 of rubber between the ply (32) and the ply (33), measured at the axially outer end of the ply (32) and substantially equal to 2 mm, then by a second working crown ply (34) formed of metal cables identical to those of the first ply (32) , and forming,an angle ß, opposed to the angle α and, in the case illustrated, equal to said angle α of 22° (but possibly being different from said angle α), with the circumferential direction, and finally by a final ply (35) of so-called elastic metal cables made of steel, oriented relative to the circumferential direction by an angle θ of the same direction as the angle ß and equal to said angle ß (but possibly being different), this last ply being a so-called protective ply, and so-called elastic cables being cables having a relative elongation of at least 4% upon rupture. The axial width L32 of the first working ply (32) is equal to 0.50 times the maximum axial width SQ of the centre section of the carcass reinforcement (1), namely 160 mm, which, for a tyre of conventional shape, is very much less than the width of the tread, which is equal in the case in question to 235 mm. The axial width L34 of the second working ply (34) is equal to the width L32. The axial width L33 of the additional ply (33) is equal to 190 mm, which represents 0.6 SQ. In fact, the width L33 of the additional ply (33) is very much greater than the width L32 (L34) of the widest working ply. The final crown ply (35), referred to as a protective ply, has a width L35 which is very slightly greater than the width L34 of the working crown plies, namely 165 mm. The rigidity of extension__ of the working ply (32) or of the working ply (34) , identical in the present case, since they are formed of the same non-hooped 9.28 metal cables made of steel which are inextensible and continuous over the entire width of the ply, said cables being arranged with the same pitch, that is to say with the same space between cables (measured perpendicular to said cables), is preferably greater than 4000 daN/mm at 0.5% relative elongation, and in the case in question equal to 5500 daN/mm. As for the additional ply (33) , its rigidity of extension for a relative elongation of 0.5% is equal to 0.91 times that of a working crown ply, and in the case in question the ply (33) is formed of non-hooped 27.23 metal cables made of steel, cut so as to have sections of cables the circumferential length of which is equal to 17% of the circumferential length of the ply, which imparts thereto a rigidity of extension of 5000 daN/mm for a relative elongation of 0.5%. The additional ply (33) may also be formed of so-called "bimodular" cables. Since a certain elasticity of the ply (33) is only useful during the shaping of the tyre in the vulcanisation mould, a cable having a low tangent modulus of extension, for example of at most 1000 daN/mm2, from the origin to 1% relative elongation and a modulus of the same nature, for instance greater than 8000 daN/mm2 , for a relative elongation of more than 2%, can be used. The tyre described above in accordance with the second variant was tested under a load of 4000 kg for an inflation pressure of 8.5 bar and at a speed of 100 km/h. The measurements of temperature at the ends of the working crown plies show a gain in terms of operating temperature which may attain 25°, which is unexpected, given the high temperatures of above 100° reached in these regions. WE CLAIM: 1. A tyre with a radial carcass reinforcement (1), haying a crown reinforcement (3) comprising at least two working crown plies (32, 34) at inextensible cables, crossed from one ply to the next, forming angles of between 10° and 45° with the circumferential direction, and in the absence of any ply formed of inextensible cables forming an angle greater than 45° with the circumferential direction, an additional, axially continuous, ply (33) formed of metallic elements oriented parallel to the circumferential direction, placed radially between the working plies (32, 24), having an axial width L33 of 50% of the maximum axial width So of the carcass reinforcement (1), charac terized in that the width L33 of the additional ply (33) is equal to 1.05 times the axial width of the widest working crown ply L32, L34, the cables of said additional ply (33) having a larger diameter than that of the cables of the working plies (32, 34). 2. A tyre as claimed in claim 1, wherein the width L33 of the additional ply (33) is equal to 1.1 times the axial width of the widest working crown ply. 3. A tyre as claimed in claim 1, wherein the first working crown ply (32) has a meridian curvature 1/r equal to the meridian curvature 1/r1 of the subjacent carcass reinforcement (1), so that it is plated parallel to said carcass reinforcement (1), profiled members (3) being interposed between the edges of the working ply (32) and the additional ply (33), the curvature of which is zero. 4. A tyre as claimed in claims 1 to 3, wherein the crown reinforcement (3) comprises a continuous so-called protective ply (35) radially located above the last working ply (34), formed of elastic metal cables, and the axial width L35 of which is equal to the axial width L34 of the radially outermost working ply. 5. A tyre as claimed in claims 1 to 4, wherein the additional ply (33) is formed of inextensible metal cables made of steel, cut so as to form sections of a length very much less than the circumference of the ply, the cuts between sections being axially offset relative to each other. 6. A tyre as claimed in one of the claims 1 to 4, wherein the additional ply (33) is formed of continuous metal cables made of steel, having, before curing, a curve representing the tensile stress as a function of the relative elongation having gradual slopes for the low elongations and a constant, steep slope for the higher elongations. 7. A tyre with a radial carcass reinforcement substantially as herein described with reference to and as illustrated in the accompanying drawings.

Full Text

The present invention relates to a tyre with radical carcass reinforcement.
The invention relates to a tyre with radial carcass reinforcement anchored in each bead to at least one bead wire, and comprising a crown reinforcement formed by at least two so-called working plies, superposed and made of wires or cables which are parallel to each other in each ply and are crossed from one ply to the other, forming angles of at most 45° in absolute value with the circumferential direction of the tyre.
French Application FR 94/15 736, which has not hitherto been published, relates to a tyre as described above, and more particularly to a "heavy goods vehicle"-type tyre, the ratio of the height above rim H to the maximum axial width S of which is at most 0.60. Said application, in order to improve the life of the crown reinforcement of such a tyre, and also the regularity of wear of the tread thereof, requires an architecture of the crown reinforcement characterised by the combined presence in said reinforcement of an axially continuous ply formed of inextensible cables forming an angle of at least 60° with the circumferential direction of the tyre, and a ply of metallic elements oriented substantially parallel to the circumferential direction, arranged radially between the two working crown plies.
The object of such an architecture is to reduce the operating temperatures prevailing at the edges of the working plies, the width of the additional ply of circumferential cables being less than the widths of the working plies.
Since the reduction of the operating temperatures in tyres is also a major concern of the manufacturers of "heavy goods vehicle" tyres, whatever the H/S form

ratio, the Applicants' has led them to look for a solution which is both effective and economic.
Accordingly, there is provided a tyre with a radial carcass reinforcement, haying a crown reinforcement comprising at least two working crown plies at inextensible cables, crossed from one ply to the next, forming angles of between 10° and 45° with the circumferential direction, and in the absence of any ply formed of inextensible cables forming an angle greater than 45° with the circumferential direction, an additional, axially continuous, ply formed of metallic elements oriented substantially parallel to the circumferential direction, placed radially between the working plies, having an axial width L33 of 50% of the maximum axial width So of the carcass reinforcement, characterized in that the width L33 of the additional ply is at least equal to 1.05 times the axial width of the widest working crown ply L32, L34, the cables of said additional ply having a larger diameter than that of the cables of the working plies.
Preferably, the additional ply will have an axial width at least equal to 1.1 times the width of the widest working crown ply.
It has been noted that not only does the arrangement set forth and claimed permit a substantial gain in terms of operating temperature without requiring a so-called triangulation ply, but furthermore, unexpectedly, it permits an increase in the safety factor of a cable being the ratio of its breaking force under tension to the maximum tensile force to which it is subjected during operation in the travelling tyre. At a constant safety factor, the weight and the cost of the additional ply can be advantageously reduced.
One advantageous manner of using the additional ply of circumferential elements, which is more particularly

suitable for tyres of H/S shape ratio of at least 0.70, consists in imparting to the first working crown ply a meridian curvature substantially equal to the meridian curvature of the subjacent carcass reinforcement, so as to be able to arrange it parallel to said carcass reinforcement without the interposition of profiled members. The additional ply is then provided with a substantially zero curvature, being separated from the first working ply by suitable profiled members, of substantially triangular shape.
"Inextensible cable" is to be understood to mean a cable, for instance a steel cable, which has a relative elongation of less than 0.5% measured at 25% of its breaking load.
Metallic elements oriented substantially parallel to the circumferential direction are elements which form angles within the range of +2.5°, -2.5° around 0° with said direction.
The reinforcement elements of the additional ply may be inextensible metal cables imparting to said ply a very high rigidity of extension under tensile stress from the low elongations onwards. The rigidity of extension
of the additional ply may be between 0.3 and 1.3 times the rigidity per unit length of a working ply of the crown reinforcement.
The rigidity of extension of a ply of
reinforcing elements results from the tensile force exerted in the direction of said elements per unit of width of ply which is necessary to obtain a given relative elongation ε, and may be expressed by the formula R = 1/p . dF/dε, R being the rigidity of the ply in question, p the pitch between elements of said

ply, dF/de the derivative of the tensile force relative to the relative elongation, and e being equal to 0.5%.
In the above context, the additional ply may be formed of so-called semi-elastic continuous steel cables, that is to say cables having relative elongations upon rupture of between 2% and 6%. These cables make it possible to obtain the level of rigidity suitable for proper distribution of the circumferential tension between the working crown plies and the additional ply. Said cables are advantageously said to be "bimodular", that is to say, having a curve of tensile stress as a function of relative elongation having gradual slopes for the low elongations and a substantially constant, steep slope for the higher elongations. The very low modulus before curing for elongations of less than 2% permits an increase in the circumferential development of the additional ply during the curing of the tyre.
The additional ply may also be formed of metal cables made of steel, oriented circumferentially and cut so as to form sections of a length very much less than the circumferential length of the ply, the cuts between sections being circumferentially offset relative to each other. Such an embodiment makes it possible, in simple manner, to impart the desired rigidity to the additional ply, said rigidity being less than the rigidity of a ply made with the same non-divided cables.
Preferably, the cables used in the additional ply will have a larger diameter than that of the cables used in the working ply.
The crown reinforcement according to the invention will advantageously be finished off by a so-called protective crown ply, formed of elastic metal cables

made of steel, oriented relative to the circumferential direction at an angle substantially equal to the angle formed by the cables of the radially outermost working crown ply, and the axial width of which is at least equal to the axial width of the radially outermost working ply.
The characteristics and advantages of the invention will be better understood with reference to the following description, which refers to the drawing, illustrating in non-limitative manner an example of embodiment, and in which the single figure 1 shows a diagram, viewed in meridian section, of a crown reinforcement according to the invention.
The tyre P, of dimension 315/80 R 22.5 X, has an H/S form ratio of 0.8, H being the height of the tyre P on its mounting rim and S its maximum axial width. Said tyre P comprises a radial carcass reinforcement (1) anchored in each bead to at least one bead wire, forming an upturn, and formed by a single ply of metal cables. This carcass reinforcement (1) is hooped by a crown reinforcement (3), formed radially from the inside to the outside
by a first working crown ply (32) formed of inextensible metal cables made of steel and oriented by an angle a, equal in the case illustrated to 22°, radially adjacent and parallel to the carcass reinforcement (1), its meridian curvature 1/r being substantially equal to the meridian curvature l/r1 of the subjacent carcass reinforcement (1), the cables respectively of the carcass ply and of the working ply being separated by a constant thickness of rubber mix,

surmounting the first working crown ply (32), by an additional ply (33) formed of inextensible metallic elements made of steel, of a circumferential length substantially equal to 1/6 of the circumferential length of the ply (33), said elements being oriented at 0°, the axially outer edges of the first working crown ply being separated from the additional ply (33) of circumferential elements by profiled members (4) of substantially triangular cross-section, the thickness e2 of rubber between the ply (32) and the ply (33), measured at the axially outer end of the ply (32) and substantially equal to 2 mm,
then by a second working crown ply (34) formed of metal cables identical to those of the first ply (32) , and forming,an angle ß, opposed to the angle α and, in the case illustrated, equal to said angle α of 22° (but possibly being different from said angle α), with the circumferential direction,
and finally by a final ply (35) of so-called elastic metal cables made of steel, oriented relative to the circumferential direction by an angle θ of the same direction as the angle ß and equal to said angle ß (but possibly being different), this last ply being a so-called protective ply, and so-called elastic cables being cables having a relative elongation of at least 4% upon rupture.
The axial width L32 of the first working ply (32) is equal to 0.50 times the maximum axial width SQ of the centre section of the carcass reinforcement (1), namely 160 mm, which, for a tyre of conventional shape, is very much less than the width of the tread, which is equal in the case in question to 235 mm. The axial

width L34 of the second working ply (34) is equal to the width L32. The axial width L33 of the additional ply (33) is equal to 190 mm, which represents 0.6 SQ. In fact, the width L33 of the additional ply (33) is very much greater than the width L32 (L34) of the widest working ply. The final crown ply (35), referred to as a protective ply, has a width L35 which is very slightly greater than the width L34 of the working crown plies, namely 165 mm.
The rigidity of extension__ of the
working ply (32) or of the working ply (34) , identical in the present case, since they are formed of the same non-hooped 9.28 metal cables made of steel which are inextensible and continuous over the entire width of the ply, said cables being arranged with the same pitch, that is to say with the same space between cables (measured perpendicular to said cables), is preferably greater than 4000 daN/mm at 0.5% relative elongation, and in the case in question equal to 5500 daN/mm. As for the additional ply (33) , its rigidity of extension for a relative elongation of 0.5% is equal to 0.91 times that of a working crown ply, and in the case in question the ply (33) is formed of non-hooped 27.23 metal cables made of steel, cut so as to have sections of cables the circumferential length of which is equal to 17% of the circumferential length of the ply, which imparts thereto a rigidity of extension of 5000 daN/mm for a relative elongation of 0.5%.
The additional ply (33) may also be formed of so-called "bimodular" cables. Since a certain elasticity of the ply (33) is only useful during the shaping of the tyre in the vulcanisation mould, a cable having a low tangent modulus of extension, for example of at most 1000 daN/mm2, from the origin to 1% relative elongation and a modulus of the same nature, for instance greater

than 8000 daN/mm2 , for a relative elongation of more than 2%, can be used.
The tyre described above in accordance with the second variant was tested under a load of 4000 kg for an inflation pressure of 8.5 bar and at a speed of 100 km/h. The measurements of temperature at the ends of the working crown plies show a gain in terms of operating temperature which may attain 25°, which is unexpected, given the high temperatures of above 100° reached in these regions.

WE CLAIM:
1. A tyre with a radial carcass reinforcement (1), haying a crown
reinforcement (3) comprising at least two working crown plies (32, 34)
at inextensible cables, crossed from one ply to the next, forming
angles of between 10° and 45° with the circumferential direction, and
in the absence of any ply formed of inextensible cables forming an
angle greater than 45° with the circumferential direction, an
additional, axially continuous, ply (33) formed of metallic elements
oriented parallel to the circumferential direction, placed radially
between the working plies (32, 24), having an axial width L33 of 50% of
the maximum axial width So of the carcass reinforcement (1), charac
terized in that the width L33 of the additional ply (33) is equal to 1.05
times the axial width of the widest working crown ply L32, L34, the
cables of said additional ply (33) having a larger diameter than that of
the cables of the working plies (32, 34).
2. A tyre as claimed in claim 1, wherein the width L33 of the
additional ply (33) is equal to 1.1 times the axial width of the widest
working crown ply.
3. A tyre as claimed in claim 1, wherein the first working crown ply
(32) has a meridian curvature 1/r equal to the meridian curvature
1/r1 of the subjacent carcass reinforcement (1), so that it is plated
parallel to said carcass reinforcement (1), profiled members (3) being
interposed between the edges of the working ply (32) and the
additional ply (33), the curvature of which is zero.
4. A tyre as claimed in claims 1 to 3, wherein the crown
reinforcement (3) comprises a continuous so-called protective ply (35)
radially located above the last working ply (34), formed of elastic metal
cables, and the axial width L35 of which is equal to the axial width L34
of the radially outermost working ply.

5. A tyre as claimed in claims 1 to 4, wherein the additional ply
(33) is formed of inextensible metal cables made of steel, cut so as to
form sections of a length very much less than the circumference of the
ply, the cuts between sections being axially offset relative to each
other.
6. A tyre as claimed in one of the claims 1 to 4, wherein the
additional ply (33) is formed of continuous metal cables made of steel,
having, before curing, a curve representing the tensile stress as a
function of the relative elongation having gradual slopes for the low
elongations and a constant, steep slope for the higher elongations.
7. A tyre with a radial carcass reinforcement substantially as
herein described with reference to and as illustrated in the
accompanying drawings.

Documents:

377-del-1997-abstract.pdf

377-del-1997-claims.pdf

377-del-1997-correspondence-others.pdf

377-del-1997-correspondence-po.pdf

377-del-1997-description (complete).pdf

377-del-1997-drawings.pdf

377-del-1997-form-1.pdf

377-del-1997-form-13.pdf

377-del-1997-form-19.pdf

377-del-1997-form-2.pdf

377-del-1997-form-3.pdf

377-del-1997-form-4.pdf

377-del-1997-form-6.pdf

377-del-1997-gpa.pdf

377-del-1997-pct-409.pdf

377-del-1997-petition-137.pdf

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Patent Number

214739

Indian Patent Application Number

377/DEL/1997

PG Journal Number

09/2008

Publication Date

29-Feb-2008

Grant Date

15-Feb-2008

Date of Filing

17-Feb-1997

Name of Patentee

COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN-MICHELIN & CIE,

Applicant Address

12, COURS SABLON, F-63040 CLERMONT-FERRAND CEDEX 01, FRANCE.

Inventors:

#	Inventor's Name	Inventor's Address
1	ANDRE COLOM	64, AVENUE DE ROYAT 63400 CHAMLIERES, FRANCE.

PCT International Classification Number

B60C 9/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	96/02178	1996-02-20	France