US4457322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline cleaning compositions non-corrosive toward aluminum surfaces
Assignee: Lever Brothers Co
•
Filing: 1983-02-11
•
Granted: 1984-07-03
•
Expires: 2003-02-11
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 V. Blarcom
- 👤 Daniel J. Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:14
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/14; C23G1/22
Claims Analysis
Total Claims: 22
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 potassium carbonate and sodium metasilicate in the ratio of about 10:1 to about 1:1, respectively, wherein sodium metasilicate is present in an effective amount up to about 2% by weight of the composition and wherein the pH ranges from about 12.0 to about 13.1.
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 potassium carbonate and sodium metasilicate in the ratio of about 10:1 to about 1:1, respectively, wherein sodium metasilicate is present in an effective amount up to about 2% by weight of the composition and wherein the pH ranges from about 12.0 to about 13.1.
Claim 3
Dependent Claim
39 words
A composition according to claim 1 wherein the potassium carbonate to sodium metasilicate ratio is about 4:1 to about 2.8:1 and wherein sodium metasilicate is present in an effective amount up to about 2.5% by weight of the composition.
Claim 4
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 lithium carbonate and sodium metasilicate in the ratio of about 1:2 to about 1:3, respectively, wherein sodium metasilicate is present in an effective amount up to about 2% by weight of the composition and wherein the pH is from about 12.0 to about 12.5.
Claim 5
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 lithium carbonate and sodium metasilicate in the ratio of about 1:2 to about 1:3, respectively, wherein sodium metasilicate is present in an effective amount up to about 2% by weight of the composition and wherein the pH is from about 12.0 to about 12.5.
Claim 6
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 potassium orthophosphate and sodium metasilicate in the ratio of about 30:1 to about 1:1, 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 12.0 to about 13.1.
Claim 7
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 potassium orthophosphate and sodium metasilicate in the ratio of about 30:1 to about 1:1, 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 12.0 to about 13.1.
Claim 8
Dependent Claim
51 words
A composition according to claim 4 wherein the ratio of potassium orthophosphate to sodium metasilicate is about 10:1 to about 1:2 and wherein sodium metasilicate is present in an effective amount up to about 2% by weight of the composition and wherein the pH ranges from about 12.7 to about 13.1.
Claim 9
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 orthophosphate and sodium metasilicate in the ratio of about 10:1 to about 1:1, respectively, wherein sodium metasilicate is present in an effective amount up to about 2% by weight of the composition and wherein the pH ranges from about 12.5 to about 12.8.
Claim 10
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 orthophosphate and sodium metasilicate in the ratio of about 10:1 to about 1:1, respectively, wherein sodium metasilicate is present in an effective amount up to about 2% by weight of the composition and wherein the pH ranges from about 12.5 to about 12.8.
Claim 11
Dependent Claim
56 words
A composition according to claim 6 consisting essentially of a mixture of sodium orthophosphate and sodium metasilicate in the ratio of about 10:1 to about 2:1, 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 12.4 to about 12.7.
Claim 12
Dependent Claim
30 words
A composition according to any one of claims 1 through 7 further comprising a surfactant chosen from the group consisting of nonionic, anionic, amphoteric and zwitterionic detergents and mixtures thereof.
Claim 13
Dependent Claim
32 words
A composition according to any one of claims 1 through 7 further comprising adjunct materials selected from the group consisting of solvents, thickeners, abrasives, perfumes, colorants, propellants and water and mixtures thereof.
Claim 14
Dependent Claim
34 words
A process 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 15
Dependent Claim
39 words
A process according to claim 1 wherein the ratio of potassium carbonate to sodium metasilicate is about 4:1 to about 2.8:1 and sodium metasilicate is present in an effective amount up to about 2.5% by weight of the composition.
Claim 16
Dependent Claim
34 words
A process for cleaning aluminum surfaces without causing significant discoloring or tarnishing of the metal comprising applying the cleaning composition according to claim 3 to the aluminum surface and rinsing the cleaning composition therefrom.
Claim 17
Dependent Claim
34 words
A process 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 18
Dependent Claim
49 words
A process according to claim 13 wherein the ratio of potassium orthophosphate to sodium metasilicate is about 10:1 to about 1:2 and sodium metasilicate is present in an effective amount up to about 2% by weight of the composition and the pH ranges from about 12.7 to about 13.1.
Claim 19
Dependent Claim
34 words
A process for cleaning aluminum surfaces without causing significant discoloring or tarnishing of the metal comprising applying the cleaning composition according to claim 6 to the aluminum surface and rinsing the cleaning composition therefrom.
Claim 20
Dependent Claim
49 words
A process according to claim 15 wherein the ratio of sodium orthophosphate to sodium metasilicate is about 10:1 to about 2:1 and sodium metasilicate is present in an effective amount up to about 1% by weight of the composition and the pH ranges from about 12.4 to about 12.7.
Claim 21
Dependent Claim
35 words
A process according to any one of claims 10 through 16 wherein the aqueous cleaning composition further comprises a surfactant chosen from the group consisting of nonionic, anionic, amphoteric and zwitterionic detergents and mixtures thereof.
Claim 22
Dependent Claim
37 words
A process according to any one of claims 10 through 16 wherein the aqueous cleaning composition further comprises adjunct materials selected from the group consisting of solvents, thickeners, abrasives, perfurmes, colorants, propellants and water and mixtures thereof.
References Cited (Backward Citations)
US2303398A
Cited
US2748035A
Cited
US2836566A
Cited
US3655582A
Cited
JPS49130904A
Cited
US4093566A
Cited
US4048121A
Cited
US4116849A
Cited
US4116851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |