Patent US3812470A successfully refreshed from Google Patents.
Patent US2915015A successfully refreshed from Google Patents.
US2915015A
Expired / Lapsed
US
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Air purging apparatus for pumps
Assignee: Sundstrand Corp
•
Filing: 1955-05-16
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Granted: 1959-12-01
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Expires: 1975-05-16
Abstract
No abstract record available.
Inventors
- 👤 Robert W Erikson
- 👤 Kiefer William Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:25
CPC Classifications
F; F04; F04C; F04C15/00; F04C15/0053; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2617
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US988175A
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US2123950A
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US2232983A
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US2346398A
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US2469362A
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US2631893A
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US2657632A
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US2763336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-30 | 1963-06-01 | 1963-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-30 | 1967-06-01 | 1967-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-30 | 1971-06-01 | 1971-12-01 | $7700.00 | Window Closed / Lapsed |