US2902390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating metal surface with hexavalent chromium compound and polyacrylic acid
Assignee: Parker Rust Proof Co
•
Filing: 1955-07-01
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Granted: 1959-09-01
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Expires: 1975-07-01
Abstract
No abstract record available.
Inventors
- 👤 Ernest P Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:04
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83; B; B05; B05D; B05D7/00; B05D7/14; B05D7/16; B32; B32B; B32B15/00; B32B15/04; B32B15/08; C09; C09D; C09D5/00; C09D5/08; C23C22/02; C23C22/04; C23C22/05; C23C22/06; C23C22/24; C23C22/26; C23C22/28; C23C22/30; C23C22/73; C23C22/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A METHOD OF COATING A METAL SURFACE WITH AN INSOLUBLE CORROSION-RESISTANT AND ADHESION-PROMOTING MATERIAL CONSISTING OF THE STEPS OF APPLYING TO THE ENTIRE SURFACE A FILM OF AN AQUEOUS ADMIXTURE CONSISTING ESSENTIALLY OF WATER, ABOUT 0.25% TO ABOUT 6% BY WEIGHT OF A HEXAVALENT CHRONIUM COMPOUND AND POLYACRYLIC ACID AND HEATING THE SAID FILM AT A TEMPERATURE IN THE RANGE OF ABOUT 250* F.-400* F. TO INSOLUBILIZE THE SAME SO AS TO COVER THE ENTIRE METAL SURFACE.
Claim 2
Independent Claim
77 words
A METHOD OF COATING A METAL SURFACE WITH AN INSOLUBLE CORROSION-RESISTANT AND ADHESION-PROMOTING MATERIAL CONSISTING OF THE STEPS OF APPLYING TO THE ENTIRE SURFACE A FILM OF AN AQUEOUS ADMIXTURE CONSISTING ESSENTIALLY OF WATER, ABOUT 0.25% TO ABOUT 6% BY WEIGHT OF A HEXAVALENT CHRONIUM COMPOUND AND POLYACRYLIC ACID AND HEATING THE SAID FILM AT A TEMPERATURE IN THE RANGE OF ABOUT 250* F.-400* F. TO INSOLUBILIZE THE SAME SO AS TO COVER THE ENTIRE METAL SURFACE.
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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) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |