Patent US2440894A successfully refreshed from Google Patents.
US4528039A
Expired / Lapsed
US
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Alkaline cleaning compositions non-corrosive toward aluminum surfaces
Assignee: Lever Brothers Co
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Filing: 1984-03-23
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Granted: 1985-07-09
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Expires: 2004-03-23
Abstract
Abstract An alkaline composition and method of cleaning aluminum surfaces is disclosed which avoids discoloring or tarnishing of the metal surface. The composition comprises a mixture of alkali metal metasilicate and a compound chosen from the group consisting of sodium carbonate, potassium carbonate, lithium carbonate, potassium orthophosphate and sodium orthophosphate and mixtures thereof, wherein the metasilicate salt is present in an effective amount up to about 3% by weight of the composition and wherein the pH ranges above about 12.0.
Inventors
- 👤 Fred K. Rubin
- 👤 David Van Blarcom
- 👤 Daniel J. Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:04
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/14; C23G1/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
67 words
An aqueous alkaline cleaning composition for aluminum surfaces which avoids discoloring or tarnishing of the metal surface consisting essentially of a mixture of sodium carbonate and sodium metasilicate in the ratio of about 20:1 to about 1:2, respectively, wherein sodium metasilicate is present in an effective amount up to about 1% by weight of the composition and wherein the pH ranges from about 12.3 to about 12.7.
Claim 2
Dependent Claim
67 words
An aqueous alkaline cleaning composition for aluminum surfaces which avoids discoloring or tarnishing of the metal surface consisting essentially of a mixture of sodium carbonate and sodium metasilicate in the ratio of about 20:1 to about 1:2, respectively, wherein sodium metasilicate is present in an effective amount up to about 1% by weight of the composition and wherein the pH ranges from about 12.3 to about 12.7.
Claim 3
Dependent Claim
28 words
A composition according to claim 1 further comprising adjunct materials selected from the group consisting of surfactants, solvents, thickeners, abrasives, perfumes, colorants, propellants and water and mixtures thereof.
Claim 4
Dependent Claim
25 words
A composition according to claim 2 wherein the surfactant is chosen from the group consisting of nonionic, anionic, amphoteric and zwitterionic detergents and mixtures thereof.
Claim 5
Dependent Claim
41 words
A composition according to claim 1 wherein the ratio of sodium carbonate to sodium metasilicate is about 3.5:1 to about 1:1, respectively, and wherein sodium metasilicate is present in an effective amount up to about 2% by weight of the composition.
Claim 6
Dependent Claim
34 words
A method for cleaning aluminum surfaces without causing significant discoloring or tarnishing of the metal comprising applying the cleaning composition according to claim 1 to the aluminum surface and rinsing the cleaning composition therefrom.
Claim 7
Dependent Claim
32 words
A method according to claim 5 wherein the cleaning composition further comprises adjunct materials selected from the group consisting of surfactants, solvents, thickeners, abrasives, perfumes, colorants, propellants and water and mixtures thereof.
Claim 8
Dependent Claim
25 words
A method according to claim 6 wherein the surfactant is chosen from the group consisting of nonionic, anionic, amphoteric and zwitterionic detergents and mixtures thereof.
Claim 9
Dependent Claim
34 words
A method for cleaning aluminum surfaces without causing significant discoloring or tarnishing of the metal comprising applying the cleaning composition according to claim 4 to the aluminum surface and rinsing the cleaning composition therefrom.
Claim 10
Dependent Claim
32 words
A method according to claim 8 wherein the cleaning composition further comprises adjunct materials selected from the group consisting of surfactants, solvents, thickeners, abrasives, perfumes, colorants, propellants and water and mixtures thereof.
Claim 11
Dependent Claim
25 words
A method according to claim 9 wherein the surfactant is chosen from the group consisting of nonionic, anionic, amphoteric and zwitterionic detergents and mixtures thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |