US2479311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of oxygen-free copper
Assignee: International Smelting and Refining Co
•
Filing: 1945-07-11
•
Granted: 1949-08-16
•
Expires: 1965-07-11
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Christensen
- 👤 Horace F Silliman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:37
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0026; C22B15/0028; C22B15/0052; C22B15/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1023604A
Cited
US1578044A
Cited
GB423697A
Cited
US1955726A
Cited
US2003889A
Cited
US2195433A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-15 | 1953-02-14 | 1953-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-15 | 1957-02-14 | 1957-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-15 | 1961-02-14 | 1961-08-16 | $7700.00 | Window Closed / Lapsed |