US4992212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline light duty liquid detergents that are non-staining to aluminum
Assignee: Lever Brothers Co
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Filing: 1988-10-18
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Granted: 1991-02-12
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Expires: 2008-10-18
Abstract
Abstract Liquid light duty cleaning compositions comprise an organic base (such as amines), a zinc salt (such as zinc halides or zinc citrate), and a complexing agent (such as EDTA). The compositions are useful in cleaning both at full strength and when diluted and do not cause staining of treated aluminum utensils.
Inventors
- 👤 Robert J. Corring
- 👤 Vincent Lamberti
- 👤 Michael P. Aronson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:15
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/14; C23G1/22; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/046; C11D3/16; C11D3/20; C11D3/2075; C11D3/2086; C11D3/2089; C11D3/26; C11D3/28; C11D3/30; C11D3/33; C11D3/36; C11D3/364; C23F; C23F11/00; C23F11/08; C23G1/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
A cleaning composition comprising: (a) 1-10% of an amine having a pKa greater than 9; (b) 0.1-4% of a zinc salt selected from the group consisting of zinc halides, zinc sulfate, zinc nitrate, and organic salts of zinc; (c) 0.1-10% of a complexing agent which is glycine; (d) 0.2-30% of an anionic surfactant; (e) 0.005-0.2% of benzotriazole, oxazoles and triazoles; and (f) water, the composition having a pH of 9-11.
Claim 2
Dependent Claim
70 words
A cleaning composition comprising: (a) 1-10% of an amine having a pKa greater than 9; (b) 0.1-4% of a zinc salt selected from the group consisting of zinc halides, zinc sulfate, zinc nitrate, and organic salts of zinc; (c) 0.1-10% of a complexing agent which is glycine; (d) 0.2-30% of an anionic surfactant; (e) 0.005-0.2% of benzotriazole, oxazoles and triazoles; and (f) water, the composition having a pH of 9-11.
Claim 3
Dependent Claim
12 words
The composition according to claim 1 further comprising 8-25% of a polyol.
Claim 4
Independent Claim
97 words
A method of cleaning a soiled aluminum surface without causing significant corrosion thereof which comprises applying to said surface a cleaning composition or aqueous solution thereof, said composition comprising: (a) 1-10% of an amine having a pKa greater than 9, (b) 0.1-4% of a zinc salt, selected from the group consisting of zinc halides, zinc sulphate, zinc nitrate and organic salts of zinc, (c) 0.1-10% of a complexing agent which is glycine, (d) 0.2-30% of an anionic surfactant, (e) 0.005-0.2% of benzotriazole; and (f) water, the composition having a pH of 9-11, and thereafter rinsing said surface.
Claim 5
Independent Claim
97 words
A method of cleaning a soiled aluminum surface without causing significant corrosion thereof which comprises applying to said surface a cleaning composition or aqueous solution thereof, said composition comprising: (a) 1-10% of an amine having a pKa greater than 9, (b) 0.1-4% of a zinc salt, selected from the group consisting of zinc halides, zinc sulphate, zinc nitrate and organic salts of zinc, (c) 0.1-10% of a complexing agent which is glycine, (d) 0.2-30% of an anionic surfactant, (e) 0.005-0.2% of benzotriazole; and (f) water, the composition having a pH of 9-11, and thereafter rinsing said surface.
Claim 6
Dependent Claim
13 words
The composition according to claim 1 further comprising 0.5-10% of a nonionic surfactant.
References Cited (Backward Citations)
US3663445A
Cited
US4145303A
Cited
US3715324A
Cited
US4002571A
Cited
US4056113A
Cited
US4070309A
Cited
US4069066A
Cited
US4297251A
Cited
US4285840A
Cited
US4164477A
Cited
US4578208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |