Patent US2684872A successfully refreshed from Google Patents.
US2684872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conveyance of granular solids
Assignee: Union Oil Company of California
•
Filing: 1950-03-13
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Granted: 1954-07-27
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Expires: 1970-03-13
Abstract
No abstract record available.
Inventors
- 👤 Clyde H O Berg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:55
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/0015; B01J8/0025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US788741A
Cited
US727030A
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GB180397A
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GB268667A
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US1846069A
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US1898356A
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US2123537A
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US2398759A
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US2524919A
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US2509984A
Cited
US2509983A
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 |