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US3479293A
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Process and composition for etching ferrous metal surfaces
Assignee: Conversion Chemical Corp
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Filing: 1966-09-26
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Granted: 1969-11-18
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Expires: 1986-09-26
Abstract
No abstract record available.
Inventors
- 👤 Kenneth P Bellinger
- 👤 Le Verne Verzier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:27
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/28; C23G; C23G1/00; C23G1/02; C23G1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3171767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |