Process for the coating of metal
Abstract
Abstract A PROCESS FOR COATING METAL WHEREIN A PHOSPHATE OR OXALATE CONVERSION COATING COMPOSITION IS APPLIED TO AN ALUMINUM, ZINC OR FERROUS METAL SURFACE TO FORM A SUBSTANTIALLY DRY, UNIFORM PHOSPHATE OR OXALATE CONVERSION COATING, A PORTION OF WHICH IS WATER-SOLUBLE. AN ORGANIC CONTAINING, REDUCING AND/OR ESTERIFYING FIXING OR IMMOBILIZING COATING COMPOSITION IS THEN APPLIED WHICH REACTS OUT THE WATER-SOLUBLE PORTION OF THE CONVERSION COATING TO PRODUCE WATER-INSOLUBLE PHOSPHATES OR OXALATES AND FORM A SUBSTANTIALLY DRY, UNIFORM COMPOSITE COATING. A HEXAVALENT CHROMIUM CONTAINING STABILIZING OR PASSIVATING COMPOSITION IS ALSO APPLIED, EITHER AS A SEPARATE STAGE OR, PREFERABLY, BY INCLUDING THE HEXAVALENT CHROMIUM MATERIAL IN THE FIXING COATING COMPOSITION. PREFERABLY, ALL OF THE COATING MATERIALS ARE APPLIED BY "MIST-ON" TYPE SPRAY APPLICATIONS.
Inventors
- 👤 Elmer H Plaxton
Bibliographic Details
Claims Analysis
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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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |