Patent US2665231A successfully refreshed from Google Patents.
US2665231A
Expired / Lapsed
US
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Coating process with alkali metal phosphate and added fluoride salt
Assignee: Parker Rust Proof Co
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Filing: 1949-06-17
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Granted: 1954-01-05
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Expires: 1969-06-17
Abstract
No abstract record available.
Inventors
- 👤 Amundsen Paul Leslie
- 👤 Walter A Osip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:50
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
100 words
IN A METHOD FOR COATING METAL SURFACES, SUCH AS IRON, STEEL, ZINC AND ALLOYS THEREOF, THE NOVEL STEP OF SUBJECTING THE METAL TO THE ACTION OF AN AQUEOUS COATING SOLUTION WHICH ESSENTIALLY CONSISTS OF AN ALKALI METAL PHOSPHATE, AND AN ACTIVATOR COMPRISING ALKALI FLUORIDES AND ALKALI ACID FLUORIDES, UNTIL A SUITABLE COATING IS FORMED THEREON, THE CONCENTRATION OF THE ALKALI FLUORIDE AND ALKALI ACID FLUORIDE BEING BALANCED TO MAINTAIN THE PH OF THE SOLUTION BETWEEN 3.0 AND 5.8, THE CONCENTRATION OF THE PHOSPHATES IN THE SOLUTION BEING BETWEEN 15 AND 95 PERCENT BY WEIGHT OF THE TOTAL CHEMICAL IN SOLUTION.
References Cited (Backward Citations)
US1022274A
Cited
US1989312A
Cited
US2105015A
Cited
US2203670A
Cited
US2316220A
Cited
US2312855A
Cited
US2477841A
Cited
US2479423A
Cited
US2500673A
Cited
US2494910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-04 | 1957-07-06 | 1958-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-04 | 1961-07-06 | 1962-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-04 | 1965-07-06 | 1966-01-05 | $7700.00 | Window Closed / Lapsed |