US3764400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing tarnish resistant copper and copper alloys
Assignee: Olin Corp
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Filing: 1971-09-02
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Granted: 1973-10-09
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Expires: 1991-09-02
Abstract
Abstract THE INSTANT INVENTION COMPRISES PROVIDING COPPER OR A COPPR ALLOY WHICH HAS ON ITS SURFACE A UNIFORM GLASSY LIKE AND SUBSTANTIALLY PORE FREE COATING OF COPPER PHOSPHATE, RINSING THE COATED MATERIAL FOR AT LEAST TWO SECONDS IN WATER AT A PH OF AT LEASE 8.0, AT A TEMPERATURE OF 90*C. TO THE BOILING POINT AND DRYING.
Inventors
- 👤 E Caule
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:28
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/78; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0393; H05K2203/00; H05K2203/03; H05K2203/0315
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |