US3294593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solution and process for producing a phosphate coating on a metal body
Assignee: Hoechst AG
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Filing: 1962-12-04
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Granted: 1966-12-27
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Expires: 1982-12-04
Abstract
No abstract record available.
Inventors
- 👤 Wyszomirski Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:22
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/08; C23C22/22; C23C22/12; C23C22/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN A PROCESS OF PRODUCING PHOSPHATE COATINGS ON SURFACES OF A METAL SELECTED FROM THE GROUP CONSISTING OF IRON, STEEL, ZINC, AND ALLOYS OF THE SAID METALS BY CONTACTING THE METAL SURFACES WITH PHOSPHATIZATION SOLUTIONS CONTAINING ZINC IONS, ALKALI METAL IONS, PHOSPHATE IONS, NITRATE IONS AND NITRITE IONS, IN WHICH SOLUTIONS THE PORTION OF NITRATE IONS IS AT LEAST AS GREAT AS THAT OF PHOSPHATE IONS, THE IMPROVEMENT OF CONTACTING THE METAL SURFACES WITH THE PHOSPHATIZATION SOLUTION AT A TEMPERATURE IN THE RANGE OF ABOUT 20*C. TO ABOUT 45*C. MAINTAINING IN THE SOLUTION A PROPORTION BY WEIGHT OF PO4:ZNO3 OF 1:0.8 TO 1.7:15 TO 3.2, AND A POINT NUMBER OF TOTAL ACID OF ABOUT 8 TO ABOUT 14 AND SUPPRESSING THE FORMATION OF FREE ACID IN THE SOLUTION BY MAINTAINING A NITRITE CONTENT OF ABOUT 0.1 TO ABOUT 1 G. PER LITER OF SOLUTION.
Claim 2
Dependent Claim
144 words
IN A PROCESS OF PRODUCING PHOSPHATE COATINGS ON SURFACES OF A METAL SELECTED FROM THE GROUP CONSISTING OF IRON, STEEL, ZINC, AND ALLOYS OF THE SAID METALS BY CONTACTING THE METAL SURFACES WITH PHOSPHATIZATION SOLUTIONS CONTAINING ZINC IONS, ALKALI METAL IONS, PHOSPHATE IONS, NITRATE IONS AND NITRITE IONS, IN WHICH SOLUTIONS THE PORTION OF NITRATE IONS IS AT LEAST AS GREAT AS THAT OF PHOSPHATE IONS, THE IMPROVEMENT OF CONTACTING THE METAL SURFACES WITH THE PHOSPHATIZATION SOLUTION AT A TEMPERATURE IN THE RANGE OF ABOUT 20*C. TO ABOUT 45*C. MAINTAINING IN THE SOLUTION A PROPORTION BY WEIGHT OF PO4:ZNO3 OF 1:0.8 TO 1.7:15 TO 3.2, AND A POINT NUMBER OF TOTAL ACID OF ABOUT 8 TO ABOUT 14 AND SUPPRESSING THE FORMATION OF FREE ACID IN THE SOLUTION BY MAINTAINING A NITRITE CONTENT OF ABOUT 0.1 TO ABOUT 1 G. PER LITER OF SOLUTION.
References Cited (Backward Citations)
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US2516139A
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US2744555A
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US2826517A
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US2863793A
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US3007817A
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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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |