Patent US3810792A successfully refreshed from Google Patents.
US3810792A
Expired / Lapsed
US
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Process for the application of phosphate coatings on steel,iron and zinc surfaces
Assignee: Callarden G dt GmbH
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Filing: 1971-12-21
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Granted: 1974-05-14
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Expires: 1991-12-21
Abstract
Abstract AN IMPROVEMENT IN THE PROCESS FOR THE APPLICATION OF PHOSPHATE COATINGS ON STEEL, IRON AND ZINC SURFACES COMPRISING CONTACTING STEEL, IRON AND ZINC SURFACES WITH AN ACIDIC SOLUTION CONTAINING LAYER-FORMING CATIONS, PHOSPHATE IONS, FLUORIDE IONS OXIDIZING AGENTS FOR A TIME SUFFICIENT TO EFFECT PHOSPHATIZING AND RECOVERING SAID PHOSPHATIZED SURFACES. THE IMPROVEMENT RESIDES IN UTILIZING FROM 59 TO 100 MOL PERCENT OF NICKEL CATIONS AS SAID LAYERFORMING CATIONS IN COMBINATIONS WITH FROM 0 TO 41 MOL PERCENT OF OTHER KNOWN DIVALENT LAYER-FORMING CATIONS. THE INVENTION ALSO RESIDES IN THE ACIDIC PHOPHATIZING SOLUTIONS.
Inventors
- 👤 C Ries
- 👤 M Prymak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:41
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/36
Claims Analysis
Total Claims: 0
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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) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |