Patent US4646299A successfully refreshed from Google Patents.
Patent US2277879A successfully refreshed from Google Patents.
US2277879A
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US
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Apparatus for controlling the level of finely divided material within containers
Assignee: PREST O LITE CO Inc
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Filing: 1938-10-12
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Granted: 1942-03-31
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Expires: 1958-10-12
Abstract
No abstract record available.
Inventors
- 👤 Ness Charles
- 👤 Hugo V Kojola
- 👤 Guy A Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:13
CPC Classifications
C; C10; C10H; C10H21/00; C10H21/08; G; G01; G01F; G01F23/00; G01F23/22; G01F23/226; Y; Y10; Y10S; Y10S101/00; Y10S101/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-03-30 | 1945-09-29 | 1946-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-03-30 | 1949-09-29 | 1950-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-03-30 | 1953-09-29 | 1954-03-31 | $7700.00 | Window Closed / Lapsed |