Patent US2976808A successfully refreshed from Google Patents.
US2976808A
Expired / Lapsed
US
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Rotary thrust pump
Assignee: HAWKRIDGE METALS Corp
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Filing: 1958-06-06
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Granted: 1961-03-28
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Expires: 1978-06-06
Abstract
No abstract record available.
Inventors
- 👤 Bert W Whitehurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:53
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/12; H02K5/128; F; F04; F04D; F04D13/00; F04D13/02; F04D13/06; F04D13/0606; F04D13/0633; F04D13/064; F04D13/0646; F04D3/00; F04D3/02; H02K5/1285
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB345574A
Cited
US2485408A
Cited
US2747512A
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US2847936A
Cited
US2807395A
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US2851955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |