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US2869850A
Expired / Lapsed
US
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Preparation of ore and method of heat treatment
Assignee: Union Carbide Corp
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Filing: 1954-03-17
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Granted: 1959-01-20
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Expires: 1974-03-17
Abstract
No abstract record available.
Inventors
- 👤 Fritz O Wienert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:48
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C22B1/2406
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1415094A
Cited
US1712132A
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US2052329A
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US2036952A
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US2127632A
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US2332219A
Cited
US2378438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |