Patent US2942741A successfully refreshed from Google Patents.
US2942741A
Expired / Lapsed
US
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Flow control system for particulate material
Assignee: California Research LLC
•
Filing: 1954-02-01
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Granted: 1960-06-28
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Expires: 1974-02-01
Abstract
No abstract record available.
Inventors
- 👤 Milton A Ausman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:29
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2631242A
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US1971716A
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US2453456A
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US2491445A
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US2613832A
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US2529583A
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US2616521A
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US2571277A
Cited
US2640936A
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US2617941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-28 | 1963-12-28 | 1964-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-28 | 1967-12-28 | 1968-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-28 | 1971-12-28 | 1972-06-28 | $7700.00 | Window Closed / Lapsed |