US3588283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum pump or compressor
Assignee: Nash Engineering Co
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Filing: 1969-10-27
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Granted: 1971-06-28
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Expires: 1989-10-27
Abstract
Abstract THE PRESENT INVENTION INCLUDES A VACUUM PUMP WHEREIN PASSAGEWAYS ARE FORMED FOR CONTROLLING A PREDETERMINED SHROUD PRESSURE INDEPENDENTLY OF ASSEMBLY CLEARANCES. THIS INVENTION INCLUDES SELECTIVELY ANGULARLY LOCATING PASSAGEWAYS BETWEEN PERIPHERAL LOBE SWEEP CHAMBERS AND ROTOR END FACE CHAMBERS, AND BETWEEN SAID ROTOR END FACE CHAMBERS AND A ROTOR HUB. INTERNAL GAS AND LIQUID LEAKAGE DUE TO PRESSURE DIFFERENTIALS IN RESPECTIVE POSITIONS WITHIN THE PUMP ASSEMBLY IS MINIMIZED.
Inventors
- 👤 James B Fitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:51
CPC Classifications
F; F04; F04C; F04C19/00
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |