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US2891884A
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Alkali metal pyrophosphate solutions and methods of forming coatings therewith
Assignee: Parker Rust Proof Co
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Filing: 1958-01-15
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Granted: 1959-06-23
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Expires: 1978-01-15
Abstract
No abstract record available.
Inventors
- 👤 Rausch Werner
- 👤 Werner Willy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:15
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/23
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
AN AQUEOUS ACIDIC SOLUTION FOR FORMING A CORROSIONRESISTANT COATING AN A METALLIC SURFACE WHICH COMPRISES AN ALKLI METAL NITRITE IN AN AMOUNT IN THE RANGE OF ABOUT 0.1 GRAM-LITER TO ABOUT 1.0 GRAM/LITER, EXPRESSED AS SODIUM NITRITE, AN ALKALI METAL PYRO-P2O5 CONTENT IN THE RANGE OF ABOUT 0.6 GRAM/LITER TO ABOUT 8 GRAM/LITER, SAID SOLUTION HAVING A PH IN THE RANGE OF ABOUT 2.7 TO ABOUT 3.7
Claim 2
Dependent Claim
67 words
AN AQUEOUS ACIDIC SOLUTION FOR FORMING A CORROSIONRESISTANT COATING AN A METALLIC SURFACE WHICH COMPRISES AN ALKLI METAL NITRITE IN AN AMOUNT IN THE RANGE OF ABOUT 0.1 GRAM-LITER TO ABOUT 1.0 GRAM/LITER, EXPRESSED AS SODIUM NITRITE, AN ALKALI METAL PYRO-P2O5 CONTENT IN THE RANGE OF ABOUT 0.6 GRAM/LITER TO ABOUT 8 GRAM/LITER, SAID SOLUTION HAVING A PH IN THE RANGE OF ABOUT 2.7 TO ABOUT 3.7
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-22 | 1962-12-22 | 1963-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-22 | 1966-12-22 | 1967-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-22 | 1970-12-22 | 1971-06-23 | $7700.00 | Window Closed / Lapsed |