US3552895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry rotary vane pump
Assignee: Crane Co
•
Filing: 1969-05-14
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Granted: 1971-01-05
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Expires: 1989-05-14
Abstract
Abstract A DRY ROTARY VANE PUMP HAVING AN ALUMINUM BORE AND ROTOR WITH A HARD ALUMINUM OXIDE COATING TO INHIBIT WEAR CAUSED BY SLIDING FRICTION BETWEEN PARTS. A TEFLON OR LIKE PLASTIC COATING MAY BE APPLIED TO THE EXTERNAL SURFACES OF THE ROTOR TO FURTHER REDUCE WEAR AND ELIMINATE THE NEED FOR WEAR PLATES AT THE ENDS OF THE ROROT.
Inventors
- 👤 Eugene S Bayley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:35
CPC Classifications
F; F04; F04C; F04C18/00; F04C18/30; F04C18/34; F04C18/344; F01; F01C; F01C21/00; F01C21/08; F01C21/10; F01C21/104; F04C2220/00; F04C2220/10; F04C2220/12; F05; F05C; F05C2225/00; F05C2225/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |