US2500673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing a phosphate coating on metals high in aluminum
Assignee: Parker Rust Proof Co
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Filing: 1947-05-22
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Granted: 1950-03-14
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Expires: 1967-05-22
Abstract
No abstract record available.
Inventors
- 👤 Robert C Gibson
- 👤 William S Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:41
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/36; C23C22/362
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A METHOD OF COATING METAL SURFACES WITH A PHOSPHATE COATING WHERE SAID SURFACES CONSIST PREDOMINANTLY OF ALUMINUM WHICH COMPRISES SPRAYING ON TO SAID SURFACES A SOLUTION CONTAINING ACID PHOSPHATE AND FLUOBORATE AND AN OXIDIZING AGENT AS ITS ESSENTIAL ACTIVE INGREDIENTS AND MAINTAINING THE BALANCE OF THE SOLUTION BY ADDING A NEUTRALIZING SODIUM COMPOUND AND ACIDIC FLUORIDE IN AMOUNTS TO COMBINE WITH ALUMINUM AND FORM NA3ALF6 AND REMOVE EXCESS ALUMINUM FROM THE SOLUTION.
Claim 2
Independent Claim
72 words
A METHOD OF COATING METAL SURFACES WITH A PHOSPHATE COATING WHERE SAID SURFACES CONSIST PREDOMINANTLY OF ALUMINUM WHICH COMPRISES SPRAYING ON TO SAID SURFACES A SOLUTION CONTAINING ACID PHOSPHATE AND FLUOBORATE AND AN OXIDIZING AGENT AS ITS ESSENTIAL ACTIVE INGREDIENTS AND MAINTAINING THE BALANCE OF THE SOLUTION BY ADDING A NEUTRALIZING SODIUM COMPOUND AND ACIDIC FLUORIDE IN AMOUNTS TO COMBINE WITH ALUMINUM AND FORM NA3ALF6 AND REMOVE EXCESS ALUMINUM FROM THE SOLUTION.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |