Title of Invention


Abstract ABSTRACT The invention concerns a vent cap or oil tank of machines and oil equipment, comprising a cup (1), clipped with means of engagement (4) with the seat of the tank (filler, and a lid (12) mounted cup and which snaps thereof. Between the cup 1 and the lid [12) there is gap allowing the vapour from the tank to the outer invention or vide versa according to the invention, said lid (12) comprises two cylindrical diaphragms (12b,12c) concentric to the cap axiom and which cooperation with the cup (1) , form, labyrinth means the flow of pours and air. cup (1)also gulide (7) supporting a level rod (8) ( containing a central, cylindrical main body (7b) . wherefrom ribs, for anchoring to the cup(1)depart, Guide (7)extents at the top, into two flexible (7c) , provided with means of engagtanant (13) of the rod(8),
Full Text

The present invention concern a vent cap for oil tails of Welcomes motor equipment and the like.
It has long been known to arrange, on certain types of machines- and motor equipment, filler traps of oil tanks which allow to keep the inner pressure of the tanks μL the same level as the outer pressure, and which are known as vent caps. This kind of cap allows the free emission from the pile tanks of part of the developing vapors, and dramatically reduces build up of condensate through the introduction of wet air into the tanks.
Moreover, such kind of caps causes the absence of vacuum or overexpressures which may damage gaskets and/or other members found within the tank.
However, since the oil in the tanks of marbinery often Undergoes violent turbulence, easily aplashing again or the tank wails and consequently against the vent cap walls, small amounts of oil may easily leak out of the cap, causing disprcion, which may pose a hazard due to the possible environmental impact thereof. Moreover, these leaks in any case obviously reduce the amounts of oil inside the Lank, with the risk - in the long run -of the residual quantity no longer being sufficient for the required functions; and moving members hence possibly becoming damaged.
various ways have been devised to provided the vent caps with means capable of limiting are deviating oil leaks. in particular, Italian utility model no. 173 the name of the stare Applicant concerns a vent cap simply containing of a threaded cup and of a snap on lid mounted on said cup and integral in rotation therewith, wherein two plash guard diaphragms are provided on the upper portion the cup, in a mutually opposite position and inclination., as well as a porous filter arranged at top of the cop champs, in order to selectively filter water vapours and oil vapours, Tne splash guazd diaphragms also carry a rib to support a level rod.


during use it has been decorated that the cap |thus shaped still has some minor drawback in particular the splash guard diagrams thus arranged are not sufficient to the oi1

level rod, keying it into a unseal seat on the diaphragm, still implies unsafe mounting, with that risk of detachment Finally, as can be. easily understood, are similar a cap
with a level rod which has & simple construction,, is capable of delimiting oil leaks wherefrom and at the same time provides a fixed and secure rod anchoring system-
Such object is achieved by the cap descried in claim 2). Other particularly preferred features of the invention are detailed in the dependent claims.
The cap according to the invention will show bow described, with reference to a particular variant thereof- an it is illustrated ill the drawings, wherein:
fiq. 1 is a view of the cap decoding to the invention, whereof
fig, 2 in an axial section view according to the line A*A of fig. 1,
fig. 3 is s view similar fig- 2 in Rn axial section according to the line B-3 of fig- 2,
fig. 4 is a top perspective view of the cup portion only of the cap according of the invention, with the level rod mounted,.
fig. 5 is a bottom view of the lid portion only of the cap according to the invention,- and
fig. 6 in a Cotton perspective view of the lid only.
The cap according to the invention compress a substantially cylindrical cup l, -which has an abutment 2,

provided below with a gaskets 3, below which there is a male-threaded spigot 4, capable of engaging with the female-threaded seat of the filler (not shown) of the oil tank for which the cap is intended. Above., cup 1 builds a chamber 5 limited sideways by a cylindrical wall fe and below by an inner abutment 2a opposed to outer abutment 2.
layside cup a and anchored thereto by our integrally-moulded radial ribs 7a, there is providad a support guide 7 for a level rod S, arranged in the middle of the cup. guide 7 consint-s of an oeoontially cylindrical main body 7b, wherefrom robs 7a depart and at the top whereof two flexible flopn 7a are provided Guide 7 is anternaily shaped to Raue the insertion and stable positioning of level rod 8; in particular, it is provided to obtain inside said base 7b r.nd along flaps 7c, a. pair of grooves, diametrically opposite to a diameter perpendicular to the gap which divides the two flapn 7c (see in particular fiq 4)-
Moreover, rod s has, near the cup; two symmetrical and opposite receives 5, capable of engaging with pair of teeth 10 formed at the top of flaps 7c and facing inwards.
t he engagement of of guide 7 arc
In order to ease insertion it provided that the head of rod S is rounded, so as to act at a bevel for receive with each 10. in turn, flaps: 7 c. manufactured, as said, with a sufficiency epidictic material so at to allow the .temporary spreading apart thereof, for the reinsertion of the rod, and the subsequent closure once teeth 1C have been engaged with recess 9.
On inner abutment 2a, between spigot 4 cud wail 6, which forms a plane shaped easentislly like a circular Crown, a porous filter 11 known per ES it: supported for the selective flow of vapors -
As a covering of the cup and of the inner structure thereof described BO tar, a lid 12 is applied, which comprises a lateral side Wal". 12a for the engagement with the outer surface of wall 6.
In acl -or fart. and as is evident from fig. 4, wall 6 is relatively thin and has radial ribs 14, wherewith the wall 12a

of lid 12 engages
Wall 12a has, along the inner perimeter thereof, engagement protrusions 12d, to allow the fisted and stable engagement with rpiccQ3ca 13 obtained along robe 14. The engagement between the protrusions of wall 12a and recesses is thus allows to manufacture the actual cap structure.
Inside said 1 LA, and freely abutting downwards from the upper surface thereof: there are further provided two cylindrical diaphragms 12b &nd 12c (see also fig- 6} which ore concentric and parallel to tail wall 3,2a.
Diaphragm 12b r.Ktonde from the top wall of the lid to porous filter 11, and lightly compresses it (as highlighted in figs. 2and 3) above.- inner- abutment 2a, with the lower end thereof- The result is a division of chamber 5 into two volumest a volume outside diaphragm 12b, forrruiig a channel between diaphragm 12b and wall 6 and between the Lop of such wall $ and the inner upper surface of lid 12, and an inner volume formed between diaphragm l2b and diaphragm 12c, respectively. Thereby, a labyrinth is furmed for the selective flow of the vapours, since - aa can be well understood - diaphragm 12b acts as AH actual partition, allowing the outflow of vapours from chamber 5 only through porous filter 11.
It must also be noted that, through the labyrinth thus created, the oil splashes which may accidentally reach chambar 5 could in the day cause the leak of oil drop3 from the cap as a

the drawing., the
matter of fact, as can bo naoily observed in
labyrinth is now shaped so visit the exit of the vapours through the filter is oriented at 90° to the direction of any splashes, so that even if large: amount oil arrived a chamber 5, they would collide with the wall of dlaphraqm 12D una of the inner upper surface of the lad between diaphragms 12b and 12c, and they would hence be guided into the underlying chamber
Moreover, during the operation tests it has been detected that the arrangement of liter inside chamber 6 and in engagement with diaphragm. 12b.r produces the remarkable result of a stationary and, it the same same, -cleaning" filler . An i matter of fact, gives the particular arrangement at the

labyrinth, the oil entering the cap chamber, in order to return to the main sank, al£Q flushes the filter, removing any debris deposited thereon, cleaning it.
As can be easily understood, the combination of these two feature allow into cap to have a much 3 linger than known-
It is evident that the main object of the invention has thus been achieved, dramatically reducing the Amount of oil which clogs the killer, and consequently virtually eliminating the amount of oil which may penetrate in the labyrinth and escape into the- environment
Moreover, diaphragm 12c has a diameter sufficient to get as a housing for the two flape 7c of guide 7. In particular, ones rod (3 is in a stationary position and lid 12 engages with the cup, diaphragm 12c engages with the- flops 7c of guide 7, which engaqes therewith and tightly inside the cup formed toy diaphragm 12c This immediately implies the tightening flaps 7c againet level rod 9, and hence also the locking r-f rnd 8 in position.
cap bndy, thereby
uring a f. laced and
Diaphragm 12c -hereby guarantees further protection for a
proceed and accurrate anchoring of rod B to the
allowing to achieve the set Abject o£ manufact
safe locking device of level red 8 inside the cap, with an
cap aucording to torn the preceding
extremely simple structure of the assembly
The mounting of the parts making up the the invention, a& can be clearly undcrotood £
description, is reirarfcably sample. The operator insert level

rod 8 into guide

the snap of teeth

to engaging with

in position, he
12b and 12 c and
recesses 9 can be heard. At that point, alter having checked
that the porous filter is precisely housed introduced lid 12 so that the two diaphiayms
outer vail 13* are in the correct position and imparts pressure sufficient to engage it with the recesses 13 provided
on ribs 14 for that purpose.
At this point., the cap is ready to be mounted on the machine, or on the pieae of equipment, by the simple screwing of spigot 4 on the oil rank filler.
It is understood that the variant descried above is only

one of the possible embodimence of the present invention and that a number of variants are possible which dip not depart from the scope of protection defined by the accompanying claims.

1, A method of causing screenout in a subteransan formation stimulation treatment to comprimg injecting a slurry of a proppant in a carrier fluid,
fracturing presure to create one or more fractures comprising;: a) injecting a pad fluid,
c) forming a filter cake comprising a solid base soluble material and
d) degrading the solid base soluble material with a base while
wherein either the pad fluid or at least a portion of the carrier fluid or both comprises the solid base -soluble material that format a filter cake.
2, A methods of graval packing a subtertancan formation comprising injecting a
slurry of a graval in a carrier fluid with a viscoslastic surfactant that is not affected by base comprising:
a) forming a filter cake comprising a solid base-soluble material and
b) degrading the filter cake with a base while injecting a slurry of a
graval in a carrier fluid.
3. the mehods claim 1 claim 2 wherein the base is from alkali
metal alkoxides,alkali metal carbonates,alkali metal bicarbonates alkali
metal lhydroxids, ammonium hydroxide, thereof
fluid loss additive selected from water-soluble polymers, crosslinked water-

soluble polymars, asbestos starch, calcium carbonate, mica, plastic particles, solid wax, wax-polymer partcles, insoluble salts, slowly soluble salts, or mixture; thereof the at least one component can be broken or dissolved.
5, The method of any of the preceding claims wherein the solid base-souble material is selected from lactide, glycolide, polylactic acid, polyglycolic acid, copolymers of polylactic aoid and polyglycolic acid, copolymers of glycolic acid with other hydroxy-, carboxlio acid-, or hydroxyoaxboxylic acid- containing moieties, copolymer of lactlc add with other hydroxy-, carboxylic acid-, or hydrosycarboxylic acid-containing moieties, or mixtures thereof,
6. The mehod of any of the preceding claims wherein the solid bass-soluble
hydroxide magncshufi carbonate, magnesium calcium carbonate, calcium carbonate, aluminium, hydroxide, calcium axalaie,calcium, phosphate,
7, The method of any of the preceding claims wherin one or more of the injected fluids compries a bridging promating material
8. the methods any of the preceding claim degradation agent is present when the filter cake is formed


136-che-2007 amended claims 14-07-2011.pdf

136-che-2007 form-3 14-07-2011.pdf


136-CHE-2007 AMENDED CLAIMS 17-02-2011.pdf

136-CHE-2007 CORRESPONDENCE OTHERS 14-07-2011.pdf

136-che-2007 form-1 17-02-2011.pdf

136-che-2007 form-3 17-02-2011.pdf

136-CHE-2007 OTHER PATENT DOCUMENT 17-02-2011.pdf

136-che-2007 other. patent.document 17-02-2011pdf.pdf

136-CHE-2007 POWER OF ATTORNEY 17-02-2011.pdf







136-che-2007-form 1.pdf

136-che-2007-form 3.pdf

136-che-2007-form 5.pdf

Patent Number 248528
Indian Patent Application Number 136/CHE/2007
PG Journal Number 30/2011
Publication Date 29-Jul-2011
Grant Date 22-Jul-2011
Date of Filing 19-Jan-2007
Name of Patentee ELESA S.p.A.
Applicant Address VIA LOCATELLI 2, I-20124 MILANO, ITALY
# Inventor's Name Inventor's Address
PCT International Classification Number B65D90/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 MI2006U000019 2006-01-20 Italy