US2931314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air purging apparatus for pumps
Assignee: Sundstrand Corp
•
Filing: 1955-05-17
•
Granted: 1960-04-05
•
Expires: 1975-05-17
Abstract
No abstract record available.
Inventors
- 👤 Robert W Erikson
- 👤 Kiefer William Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:38
CPC Classifications
F; F04; F04C; F04C15/00; F04C15/0053
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2071800A
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US2159720A
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US2123950A
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US2149969A
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US2262617A
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US2229231A
Cited
US2346398A
Cited
US2442361A
Cited
US2635620A
Cited
US2657632A
Cited
US2763336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |