Patent US3764981A successfully refreshed from Google Patents.
US2670801A
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US
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Recovery of hydrocarbons
Assignee: Union Oil Company of California
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Filing: 1948-08-13
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Granted: 1954-03-02
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Expires: 1968-08-13
Abstract
No abstract record available.
Inventors
- 👤 John E Sherborne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:30
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/08; B01J19/10; E; E21; E21B; E21B28/00; E21B43/00; E21B43/003; E21B43/16; E21B43/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE23381E
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US1491138A
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US2184809A
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US2355618A
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US2437456A
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US2350212A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |