US3677906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for producing thin copper foil
Assignee: Kennecott Utah Copper LLC
•
Filing: 1970-12-17
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Granted: 1972-07-18
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Expires: 1990-12-17
Abstract
Abstract A PROCESS AND APPARATUS FOR PRODUCING THIN COPPER FOILS BY ELECTROPLATING THE COPPER ONTO A ROTATING DRUM WHICH IS CONNECTED AS A CATHODE. THE SURFACE OF THE ROTATING DRUM IS RHENIUM.
Inventors
- 👤 Chih-Chung Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:06
CPC Classifications
C; C25; C25D; C25D1/00; C25D1/04
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |