Patent US5200114A successfully refreshed from Google Patents.
US5200114A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline cleaner for reducing stain on aluminum surfaces
Assignee: PPG Industries Ohio Inc
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Filing: 1991-11-12
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Granted: 1993-04-06
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Expires: 2011-11-12
Abstract
Abstract An aqueous alkaline cleaner and a process are described for reducing the discoloration of aluminum surfaces treated with are aqueous alkaline cleaner compositions. The process comprises including in the aqueous cleaner composition, an effective amount of at least one heterocyclic compound. Enhanced mobility of the aluminum surfaces also can be obtained when the heterocyclic compound is a solid particulate compound which is mixed with an oil prior to addition to the aqueous alkaline cleaner. In a preferred embodiment, the heterocyclic compounds are soluble pyrroles, imidazoles, pyrazoles, thiazoles or triazoles.
Inventors
- 👤 Leslie M. Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:39
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/14; C23G1/22; C23G1/02; C23G1/12; C23G1/125
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
89 words
An aqueous alkaline composition having a pH in the range of from about 11.5 to about 12.5 useful for cleaning aluminum surfaces comprising from about 20 to about 75% by weight of at least one inorganic base; from about 1 to about 15% by weight of at least one metal complexing agent; from about 1 to about 20% by weight of at least one heterocyclic compound selected from the group consisting of a pyrrole, imidazole or pyrazole compound; and from about 10 to about 70% by weight of water.
Claim 2
Dependent Claim
89 words
An aqueous alkaline composition having a pH in the range of from about 11.5 to about 12.5 useful for cleaning aluminum surfaces comprising from about 20 to about 75% by weight of at least one inorganic base; from about 1 to about 15% by weight of at least one metal complexing agent; from about 1 to about 20% by weight of at least one heterocyclic compound selected from the group consisting of a pyrrole, imidazole or pyrazole compound; and from about 10 to about 70% by weight of water.
Claim 3
Dependent Claim
16 words
The composition of claim 1 wherein the inorganic base is at least one alkali metal hydroxide.
Claim 4
Dependent Claim
11 words
The composition of claim 1 also containing at least one surfactant.
Claim 5
Dependent Claim
12 words
The composition of claim 1 wherein the heterocyclic compound is an imidazole.
Claim 6
Dependent Claim
15 words
The composition of claim 1 wherein the heterocyclic compound is benzimidazole or a substituted benzimidazole.
Claim 7
Dependent Claim
19 words
The composition of claim 1 wherein the metal complexing agent is at least one sugar acid or salts thereof.
Claim 8
Dependent Claim
18 words
The composition of claim 1 wherein the pH of the composition is from about 11.8 to about 12.5.
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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) | 1996-04-05 | 1996-10-05 | 1997-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-05 | 2000-10-05 | 2001-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-05 | 2004-10-05 | 2005-04-06 | $7700.00 | Window Closed / Lapsed |