Patent US2769737A successfully refreshed from Google Patents.
US2769737A
Expired / Lapsed
US
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Amine phosphate coating solutions and method of coating
Assignee: Parker Rust Proof Co
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Filing: 1952-03-26
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Granted: 1956-11-06
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Expires: 1972-03-26
Abstract
No abstract record available.
Inventors
- 👤 William S Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:38
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A METHOD FOR CLEANING AND PRODUCING A METALLIC PHOSPHATE COATING ON A METAL OF THE CLASS CONSISTING OF MILD STEEL, ZINC AND ALUMINUM WHICH COMPRISES THE STEP OF CONTACTING THE SURFACE OF THE METAL WITH AN ACIDIC AQUEOUS SOLUTION ESSENTIALLY OF PHOSPHORIC ACID, WATER AND A SUBSTITUTED AMINE PHOSPHATE HAVING THE STRUCTURE:
Claim 2
Independent Claim
52 words
A METHOD FOR CLEANING AND PRODUCING A METALLIC PHOSPHATE COATING ON A METAL OF THE CLASS CONSISTING OF MILD STEEL, ZINC AND ALUMINUM WHICH COMPRISES THE STEP OF CONTACTING THE SURFACE OF THE METAL WITH AN ACIDIC AQUEOUS SOLUTION ESSENTIALLY OF PHOSPHORIC ACID, WATER AND A SUBSTITUTED AMINE PHOSPHATE HAVING THE STRUCTURE:
References Cited (Backward Citations)
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US2416734A
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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) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |