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Patent US1773839A successfully refreshed from Google Patents.
US1773839A
Expired / Lapsed
US
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Treatment of shale
Assignee: PETROLEUM DERIVATIVES Inc
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Filing: 1920-10-15
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Granted: 1930-08-26
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Expires: 1940-10-15
Abstract
No abstract record available.
Inventors
- 👤 John D Zieley
- 👤 Ferdinand A Rudolf
- 👤 James C Ryder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:36
CPC Classifications
C; C10; C10B; C10B53/00; C10B53/06; C10B55/00
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) | 1933-08-25 | 1934-02-24 | 1934-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-08-25 | 1938-02-24 | 1938-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-08-25 | 1942-02-24 | 1942-08-26 | $7700.00 | Window Closed / Lapsed |