Patent US3833953A successfully refreshed from Google Patents.
Patent US2002997A successfully refreshed from Google Patents.
US2002997A
Expired / Lapsed
US
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Destructive hydrogenation of carbonaceous material
Assignee: Standard IG Co
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Filing: 1931-10-23
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Granted: 1935-05-28
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Expires: 1951-10-23
Abstract
No abstract record available.
Inventors
- 👤 Herold Paul
- 👤 Kaufmann Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:33
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/08; C10G1/086
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) | 1938-05-27 | 1938-11-26 | 1939-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-05-27 | 1942-11-26 | 1943-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-05-27 | 1946-11-26 | 1947-05-28 | $7700.00 | Window Closed / Lapsed |