Patent US3434808A successfully refreshed from Google Patents.
US3434808A
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Method and means for pumping powdered solids
Assignee: Columbian Carbon Co
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Filing: 1967-12-21
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Granted: 1969-03-25
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Expires: 1987-12-21
Abstract
No abstract record available.
Inventors
- 👤 David F Pobst Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:45
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; B; B65; B65G; B65G65/00; B65G65/30; B65G65/34; B65G65/40; B65G65/44; F; F04; F04B; F04B43/00; F04B43/02; F04B53/00; F04B53/10; F04B53/102; F04B53/1032; C01; C01P; C01P2004/00; C01P2004/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1609401A
Cited
US2424595A
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US2667280A
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US2837415A
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US3025550A
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US3102005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |