US2982844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of metals
Assignee: National Research Corp
•
Filing: 1957-01-07
•
Granted: 1961-05-02
•
Expires: 1977-01-07
Abstract
No abstract record available.
Inventors
- 👤 John L Ham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:48
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1295
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2124261A
Cited
US2541764A
Cited
US2800519A
Cited
US2782114A
Cited
US2826492A
Cited
US2727936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |