Patent US2684870A successfully refreshed from Google Patents.
US2684870A
Expired / Lapsed
US
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Conveyance of granular solids
Assignee: Union Oil Company of California
•
Filing: 1948-12-24
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Granted: 1954-07-27
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Expires: 1968-12-24
Abstract
No abstract record available.
Inventors
- 👤 Clyde H O Berg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:26
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/0015; B01J8/0025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US584021A
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US788741A
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US727030A
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GB180397A
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GB268667A
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US1825707A
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US1898354A
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US1893505A
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US2328240A
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US2413479A
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US2304827A
Cited
US2493911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |