Patent US1830236A successfully refreshed from Google Patents.
US2701331A
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Pumping apparatus with electromagnetically propelled piston
Assignee: FRANK K BENNIE
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Filing: 1949-08-29
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Granted: 1955-02-01
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Expires: 1969-08-29
Abstract
No abstract record available.
Inventors
- 👤 John C Holst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:23
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/16; F04B53/162; F04B53/166; F04B17/00; F04B17/03; F04B17/04; F04B17/042; F04B17/044; F04B5/00; F04B5/02; H; H02; H02K; H02K33/00; H02K33/12; H02K33/14; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0469; F05C2201/0475; F05C2201/0478; F05C2251/00; F05C2251/12; F05C2251/125
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US494956A
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US496331A
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US581204A
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US1647147A
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US1640742A
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US1637425A
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US1804376A
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US1974262A
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US2365632A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-31 | 1958-08-02 | 1959-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-31 | 1962-08-02 | 1963-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-31 | 1966-08-02 | 1967-02-01 | $7700.00 | Window Closed / Lapsed |