Patent US2839438A successfully refreshed from Google Patents.
US2839438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wash primer for metal surfaces
Assignee: Thompson and Co
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Filing: 1953-04-27
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Granted: 1958-06-17
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Expires: 1973-04-27
Abstract
No abstract record available.
Inventors
- 👤 Rosenbloom Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:42
CPC Classifications
C; C09; C09D; C09D129/00; C09D129/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE COMBINATION WITH A WASH PRIMER CONSISTING ESSENTIALLY OF LEAD CHROMATE AND A SOLUTION IN A POLAR SOLVENT OF AN HYDROXYL-CONTAINING POLYVINYL ACETAL AND PHOSPHORIC ACID, OF AT LEAST ONE STRONG MINERAL ACID OF THE GROUP CONSISTING OF HYDROCHLORIC, SULFURIC AND NITRIC ACIDS, THE AMOUNT OF ACID, IN PERCENT BY WEIGHT BASED ON THE NON-VOLATILE SOLIDS CONTENT OF THE PRIMER, BEING FROM ABOUT 0.04 TO ABOUT 0.16 PERCENT OF HCL, NOT OVER ABOUT 0.4 PERCENT OF H2SO4, AND FROM ABOUT 0.032 TO ABOUT 9 PERCENT OF HNO3.
Claim 2
Dependent Claim
87 words
THE COMBINATION WITH A WASH PRIMER CONSISTING ESSENTIALLY OF LEAD CHROMATE AND A SOLUTION IN A POLAR SOLVENT OF AN HYDROXYL-CONTAINING POLYVINYL ACETAL AND PHOSPHORIC ACID, OF AT LEAST ONE STRONG MINERAL ACID OF THE GROUP CONSISTING OF HYDROCHLORIC, SULFURIC AND NITRIC ACIDS, THE AMOUNT OF ACID, IN PERCENT BY WEIGHT BASED ON THE NON-VOLATILE SOLIDS CONTENT OF THE PRIMER, BEING FROM ABOUT 0.04 TO ABOUT 0.16 PERCENT OF HCL, NOT OVER ABOUT 0.4 PERCENT OF H2SO4, AND FROM ABOUT 0.032 TO ABOUT 9 PERCENT OF HNO3.
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) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |