Patent US3568169A successfully refreshed from Google Patents.
Patent US1942923A successfully refreshed from Google Patents.
US1942923A
Expired / Lapsed
US
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Method of treating copper and copper alloys
Assignee: Battelle Memorial Institute Inc
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Filing: 1932-11-11
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Granted: 1934-01-09
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Expires: 1952-11-11
Abstract
No abstract record available.
Inventors
- 👤 Clarence E Irion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:40
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/48; C23C22/52
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) | 1937-01-08 | 1937-07-10 | 1938-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-01-08 | 1941-07-10 | 1942-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-01-08 | 1945-07-10 | 1946-01-09 | $7700.00 | Window Closed / Lapsed |