Patent US3697331A successfully refreshed from Google Patents.
US3697331A
Expired / Lapsed
US
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Process for the after-treatment of phosphate-coatings
Assignee: Hooker Chemical Corp
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Filing: 1970-12-28
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Granted: 1972-10-10
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Expires: 1990-12-28
Abstract
Abstract A PROCESS FOR THE AFTER-TREATMENT OF PHOSPHATIZED METAL ARTICLES, WHICH PROCESS COMPRISES TREATING THE PHOSPHATIZED SURFACE OF THE METAL ARTICLE WITH AQUEOUS SOLUTION CONTAINING AN ALKALI METAL SALT OF A NOVOLAC PHENOL-FORMALDEHYDE RESIN HAVING A MOLECULAR WEIGTH OF FROM ABOUT 300 TO ABOUT 5,000, AND HEATING THE TREATED ARTICLE AT A TEMPERATURE OF AT LEAST ABOUT 190*C. IN THE PRESENCE OF AN OXYGEN-CONTAINING ATMOSPHERE. THE ARTICLES SO TREATED ARE RENDERED EXCEPTIONALLY RESISTANT TO CORROSION AND TO UNDERCUTTING WHEN COATED WITH FINAL FINISH COATINGS.
Inventors
- 👤 Malcolm H Shatz
- 👤 Edward Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:54
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D7/16; C; C09; C09D; C09D161/00; C09D161/04; C09D161/06; C09D161/14; C23; C23C; C23C22/00; C23C22/82; C23C22/83
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |