US2778313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control means for pumping apparatus
Assignee: Perfect Circle Corp
•
Filing: 1951-12-17
•
Granted: 1957-01-22
•
Expires: 1971-12-17
Abstract
No abstract record available.
Inventors
- 👤 Robert H Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:03
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2258371A
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US2344946A
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US2409688A
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US2403688A
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US2512765A
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US2466440A
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US2707440A
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US2688719A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |