US2521757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion of heavy hydrocarbon materials
Assignee: Houdry Process Corp
•
Filing: 1945-12-15
•
Granted: 1950-09-12
•
Expires: 1965-12-15
Abstract
No abstract record available.
Inventors
- 👤 Elgene A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:23
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/14; C10G11/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2278228A
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US2298355A
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US2308557A
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US2382755A
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US2378531A
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US2388055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |