Title of Invention	A WATER SOLUBLE CHEMICAL CLEANING COMPOSITION IN TABLET FORM
Abstract	The present invention relates to a water soluble chemical cleaning composition in tablet form for surfaces of silver or copper or alloys thereof comprising a chemical cleaning agent, an anionic surfactant and an acidifier characterised in that the chemical cleaning agent is selected from one or more of thiourea, methyl thicurea and ethyl thiourea, the anionic surface active agent is sodium lauryl sulphate and the acidifier comprises a combination of sulphamic acid and citric acid.

Title of Invention

A WATER SOLUBLE CHEMICAL CLEANING COMPOSITION IN TABLET FORM

Abstract

The present invention relates to a water soluble chemical cleaning composition in tablet form for surfaces of silver or copper or alloys thereof comprising a chemical cleaning agent, an anionic surfactant and an acidifier characterised in that the chemical cleaning agent is selected from one or more of thiourea, methyl thicurea and ethyl thiourea, the anionic surface active agent is sodium lauryl sulphate and the acidifier comprises a combination of sulphamic acid and citric acid.

Full Text	s This invention relates to a water soluble chemical cleaning composition in tablet form for surfaces of silver or copper, or alloys based on silver or on copper (e.g. brass), and more particularly but not exclusively provides compositions and formulations suitable for cleaning silver objects such as those used for ornamental, decorative or functional purposes. The objects whose surfaces are to be cleaned may, for example, be formed of sterling silver, solid silver, electro-plated nickel silver (EPNS), or brass. Typical examples of objects which are often fabricated from silver or silver-based metals are cutlery, goblets, candlesticks, figurines, frames for photographs, and jewelry. For convenience, the invention will be described hereafter in relation to the cleaning of silver surfaces, it being understood that the invention is of wider applicability, as already indicated. It is well-known that a drawback of silver is the tendency to form a dark coating (tarnish) on its surface under normal atmospheric conditions. The tarnish forms quickly and is difficult to remove. Prior art cleaning compositions for silver items are conventionally of two types, namely (a) abrasive polishes and (b) chemical solvents for the tarnish. As well as these, electrochemical methods have been used. Polishes abrade the tamish and may also wear away the silver itself, which is a problem particularly with EPNS, and the fine abrasive materials used can lodge in intricate decorations on the surface of the object, from where they are hard to remove. Currently, the most common form of chemical solvent is a “dip cleaner"; these are acidic solutions WE CLAIM: 1. A water soluble chemical cleaning composition in tablet form for surfaces of silver or copper or alloys thereof comprising a chemical cleaning agent, an anionic surfactant and an acidifier characterised in that the chemical cleaning agent is selected from one or more of thiourea, methyl thicurea and ethyl thiourea, the anionic surface active agent is sodium lauryl sulphate and the acidifier comprises a combination of sulphamic acid and citric acid. 2. The composition as claimed in claim 1 further comprising at least one disintegrant, selected from starch, cation exchange resins, crosslinked polyvinyl pyrroUdone, cellulose materials and alkali metal carbonates combined with citric acid or tartaric acid. 3. The composition as claimed in any one of claims 1 and 2 further comprising at least one diluent, selected from dicalcium phosphate, lactose, microcrystalline cellulose, sodium chloride, and potassium sulphate. 4. The composition as claimed in claim 3 further comprising at least one tamish inhibitor selected from alkyl mercaptans, alkyl-aryl mercaptans, hydroxy-substituted mercapto-sulphides, mercapto- organosilicones and mercaptothioethers. 5. The composition as claimed in any one of the preceding claims, which further comprises one or more of agents selected from a glidant, a perfinne, a lubricant, a binder including polyethylene glycol 4000, a dyestuff and a pigment. 6, The composition as claimed in any one of the preceding claims comprising i) less than 60% weight for weight (w/w) thiourea; ii) less than 4.0% (w/w) sodium lauryl sulphate; iii) less than 40% (w/w) sulphamic acid and citric acid; iv) less than 20% (w/w) sodium carbonate and sodium bicarbonate; v) less than 10% (w/w) polyethylene glycol; 15 vi) less than 40%) (w/w) potassium sulphate; vii) less than 1% (w/w) lubricant; viii) less than 1% (w/w) perfume; and ix) less than 1% (w/w) dyestuffs. 7. The composition as claimed in claim 6 comprising i) 10 to 50% (w/w) thiourea; ii) 0,15 to 0.5% (w/w) sodium lauryl sulphate; iii) 15 to 30% (w/w) sulphamic acid and citric acid; iv) 5 to 12% (w/w) sodium carbonate and sodium bicarbonate; v) 3 to 7% (w/w) polythylene glycol; and vi) 10 to 20% (w/w) potassium sulphate.

Full Text

s

This invention relates to a water soluble chemical cleaning composition in tablet form for surfaces of silver or copper, or alloys based on silver or on copper (e.g. brass), and more particularly but not exclusively provides compositions and formulations suitable for cleaning silver objects such as those used for ornamental, decorative or functional purposes. The objects whose surfaces are to be cleaned may, for example, be formed of sterling silver, solid silver, electro-plated nickel silver (EPNS), or brass. Typical examples of objects which are often fabricated from silver or silver-based metals are cutlery, goblets, candlesticks, figurines, frames for photographs, and jewelry. For convenience, the invention will be described hereafter in relation to the cleaning of silver surfaces, it being understood that the invention is of wider applicability, as already indicated.
It is well-known that a drawback of silver is the tendency to form a dark coating (tarnish) on its surface under normal atmospheric conditions. The tarnish forms quickly and is difficult to remove.
Prior art cleaning compositions for silver items are conventionally of two types, namely (a) abrasive polishes and (b) chemical solvents for the tarnish. As well as these, electrochemical methods have been used. Polishes abrade the tamish and may also wear away the silver itself, which is a problem particularly with EPNS, and the fine abrasive materials used can lodge in intricate decorations on the surface of the object, from where they are hard to remove.
Currently, the most common form of chemical solvent is a “dip cleaner"; these
are acidic solutions

WE CLAIM:
1. A water soluble chemical cleaning composition in tablet form for surfaces of silver or copper or alloys thereof comprising a chemical cleaning agent, an anionic surfactant and an acidifier characterised in that the chemical cleaning agent is selected from one or more of thiourea, methyl thicurea and ethyl thiourea, the anionic surface active agent is sodium lauryl sulphate and the acidifier comprises a combination of sulphamic acid and citric acid.
2. The composition as claimed in claim 1 further comprising at least one disintegrant, selected from starch, cation exchange resins, crosslinked polyvinyl pyrroUdone, cellulose materials and alkali metal carbonates combined with citric acid or tartaric acid.
3. The composition as claimed in any one of claims 1 and 2 further comprising at least one diluent, selected from dicalcium phosphate, lactose, microcrystalline cellulose, sodium chloride, and potassium sulphate.
4. The composition as claimed in claim 3 further comprising at least one tamish inhibitor selected from alkyl mercaptans, alkyl-aryl mercaptans, hydroxy-substituted mercapto-sulphides, mercapto- organosilicones and mercaptothioethers.
5. The composition as claimed in any one of the preceding claims, which further
comprises one or more of agents selected from a glidant, a perfinne, a lubricant, a
binder including polyethylene glycol 4000, a dyestuff and a pigment.

6, The composition as claimed in any one of the preceding claims comprising
i) less than 60% weight for weight (w/w) thiourea;
ii) less than 4.0% (w/w) sodium lauryl sulphate;
iii) less than 40% (w/w) sulphamic acid and citric acid;
iv) less than 20% (w/w) sodium carbonate and sodium bicarbonate;
v) less than 10% (w/w) polyethylene glycol; 15
vi) less than 40%) (w/w) potassium sulphate;
vii) less than 1% (w/w) lubricant;
viii) less than 1% (w/w) perfume; and
ix) less than 1% (w/w) dyestuffs.
7. The composition as claimed in claim 6 comprising
i) 10 to 50% (w/w) thiourea;
ii) 0,15 to 0.5% (w/w) sodium lauryl sulphate;
iii) 15 to 30% (w/w) sulphamic acid and citric acid;
iv) 5 to 12% (w/w) sodium carbonate and sodium bicarbonate;
v) 3 to 7% (w/w) polythylene glycol; and
vi) 10 to 20% (w/w) potassium sulphate.

Documents:

1178-mas-1997- abstract.pdf

1178-mas-1997- claims duplicate.pdf

1178-mas-1997- claims original.pdf

1178-mas-1997- correspondence others.pdf

1178-mas-1997- correspondence po.pdf

1178-mas-1997- description complete duplicate.pdf

1178-mas-1997- description complete original.pdf

1178-mas-1997- drawings.pdf

1178-mas-1997- form 1.pdf

1178-mas-1997- form 26.pdf

1178-mas-1997- form 3.pdf

1178-mas-1997- form 4.pdf

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Patent Number

207802

Indian Patent Application Number

1178/MAS/1997

PG Journal Number

26/2007

Publication Date

29-Jun-2007

Grant Date

27-Jun-2007

Date of Filing

03-Jun-1997

Name of Patentee

RECKITT BENCKISER (UK) LIMITED

Applicant Address

103-105 BATH ROAD, SLOUGH, BERKSHIRE, SL1 BUH.

Inventors:

#	Inventor's Name	Inventor's Address
1	MARK LAING	2 INGLEFIELD CLOSE, BEVERLEY, EAST YORKSHIRE, HU17 8XG.
2	MARK BEESTON	37 LYNBROOK CLOSE, HOLLYWOOD, BIRMINGHAM B47 5PU.

PCT International Classification Number

C23G1/10

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	9612016.7	1996-06-08	U.K.