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Patent US3427985A successfully refreshed from Google Patents.
US3427985A
Expired / Lapsed
US
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Three-gear pump with movable elements having plurality of sealing forces
Assignee: Chandler Evans Inc
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Filing: 1967-08-09
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Granted: 1969-02-18
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Expires: 1987-08-09
Abstract
No abstract record available.
Inventors
- 👤 Le Roy A Difford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:17
CPC Classifications
F; F04; F04C; F04C15/00; F04C15/0003; F04C15/0007; F04C15/0019
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US89268A
Cited
US164147A
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US3123011A
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US689251A
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US1118533A
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US2742862A
Cited
US2996999A
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US3208393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |