US2957427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-regulating pumping mechanism
Assignee: Individual
•
Filing: 1956-12-28
•
Granted: 1960-10-25
•
Expires: 1976-12-28
Abstract
No abstract record available.
Inventors
- 👤 Walter J O'connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:51
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/10; F04C2/107; F04C2/1071; F04C2/1073; F04C2250/00; F04C2250/20; F04C2250/201
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USRE24079E
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US2733854A
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US2028407A
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US2369539A
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US2691347A
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US2778313A
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US2765114A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |