Patent US2202901A successfully refreshed from Google Patents.
US2202901A
Expired / Lapsed
US
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Treatment of carbonaceous materials
Assignee: Henry Dreyfuss Associates LLC
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Filing: 1937-12-24
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Granted: 1940-06-04
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Expires: 1957-12-24
Abstract
No abstract record available.
Inventors
- 👤 Dreyfus Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:03
CPC Classifications
C; C10; C10G; C10G19/00; C10C; C10C1/00; C10C1/20; C10G29/00; C10G29/02; C10G29/04; C10G29/06; C10L; C10L9/00; C10L9/02
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) | 1943-06-04 | 1943-12-04 | 1944-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-06-04 | 1947-12-04 | 1948-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-06-04 | 1951-12-04 | 1952-06-04 | $7700.00 | Window Closed / Lapsed |