Patent US1940352A successfully refreshed from Google Patents.
US1940352A
Expired / Lapsed
US
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Process for treating powdered coal
Assignee: Individual
•
Filing: 1931-09-15
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Granted: 1933-12-19
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Expires: 1951-09-15
Abstract
No abstract record available.
Inventors
- 👤 Jacobson Carl Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:15
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3045; C09C1/3054; B; B01; B01J; B01J20/00; B01J20/02; B01J20/20; C09C1/0003; C09C1/40; C09C1/42; C09C1/44; C09C1/48; C09C1/56; C09C3/00; C09C3/06; C09C3/063
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) | 1936-12-18 | 1937-06-19 | 1937-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-12-18 | 1941-06-19 | 1941-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-12-18 | 1945-06-19 | 1945-12-19 | $7700.00 | Window Closed / Lapsed |