Patent US3874773A successfully refreshed from Google Patents.
Patent US3539281A successfully refreshed from Google Patents.
US3539281A
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Sliding-vane rotary fluid displacement machine
Assignee: Ingersoll Rand Co
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Filing: 1968-07-22
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Granted: 1970-11-10
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Expires: 1988-07-22
Abstract
No abstract record available.
Inventors
- 👤 Leo Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:23
CPC Classifications
F; F01; F01C; F01C21/00; F01C21/08; F01C21/0809; F01C21/0818; F01C21/0827; F01C21/0836; F01C1/00; F01C1/30; F01C1/34; F01C1/344; F01C1/3441; F01C1/3442
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US566959A
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US3038412A
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US1664987A
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US2646004A
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US2782724A
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US3204563A
Cited
US3358653A
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US3437009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |