US3586612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anodic phosphating of metallic articles
Assignee: Council of Scientific and Industrial Research
•
Filing: 1969-03-27
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Granted: 1971-06-22
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Expires: 1989-03-27
Abstract
Abstract A METALLIC ARTICLE IS IMMERSED IN SODIUM PHOSPHATE SOLUTION AS THE POSITIVE ELECTRODE AND, MAINTAINING THE POTENTIAL IN THE RANGE OF -0.4 V. TO +0.2 V., A PH OF 3-5.5, AND THE CELL CURRENT IN THE RANGE OF 0.9 A/SQ. FT. TO 22.5 A./SQ. FT., A HEAVY COATING IS PRODUCED.
Inventors
- 👤 Kummattithidal S Rajagopalan
- 👤 Balasubramanya Dandapani
- 👤 Anathakrishnan Jeyaraman
- 👤 Chakravarti Rajagopal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:10
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/36
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |