Patent US6544822B2 successfully refreshed from Google Patents.
US4199488A
Expired / Lapsed
US
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Metal treating
Assignee: Henkel Corp
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Filing: 1978-05-01
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Granted: 1980-04-22
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Expires: 1998-05-01
Abstract
Abstract An auto-phoretic aqueous acidic coating composition is free of fluoride and hydrogen peroxide and contains an organic film forming resin, phosphate and a nitrobenzoic acid or derivative thereof. The composition imparts corrosion resistance when contacted with a metal surface.
Inventors
- 👤 Dennis B. Freeman
- 👤 John L. Prosser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:47
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08; C09D5/088; B; B05; B05D; B05D7/00; B05D7/14; B05D7/142
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
41 words
An aqueous acidic composition free of fluoride and hydrogen peroxide comprising a film-forming organic resin, phosphoric acid and a water soluble nitrobenzoic acid or derivative thereof selected from the group consisting of the alkali metal, ammonium and amine salts and esters.
Claim 2
Dependent Claim
41 words
An aqueous acidic composition free of fluoride and hydrogen peroxide comprising a film-forming organic resin, phosphoric acid and a water soluble nitrobenzoic acid or derivative thereof selected from the group consisting of the alkali metal, ammonium and amine salts and esters.
Claim 3
Dependent Claim
15 words
The composition of claim 1, wherein the resin content is from 20 to 200 g/l.
Claim 4
Dependent Claim
18 words
The composition of claim 1 or 2, wherein the phosphoric acid content is from 0.3 to 3 g/l.
Claim 5
Dependent Claim
23 words
The composition of claim 1 or 2, wherein the concentration of the nitrobenzoic acid or derivative thereof is from 0.25 to 3 g/l.
Claim 6
Dependent Claim
10 words
The composition of claim 1 or 2, comprising m-nitrobenzoic acid.
Claim 7
Dependent Claim
20 words
A process for imparting corrosion resistance to a metal surface comprising contacting the surface with the composition of claim 1.
References Cited (Backward Citations)
US4030945A
Cited
US3935150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-22 | 1983-10-22 | 1984-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-22 | 1987-10-22 | 1988-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-22 | 1991-10-22 | 1992-04-22 | $7700.00 | Window Closed / Lapsed |