US3381891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-chamber rotary vane compressor
Assignee: Studebaker Worthington Inc
•
Filing: 1966-03-02
•
Granted: 1968-05-07
•
Expires: 1986-03-02
Abstract
No abstract record available.
Inventors
- 👤 Friedrich O Bellmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:14
CPC Classifications
F; F04; F04C; F04C28/00; F04C28/02; F04C18/00; F04C18/30; F04C18/34; F04C18/344; F04C18/3446
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1523698A
Cited
US2569640A
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US2570832A
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US2565651A
Cited
US2832199A
Cited
US2887060A
Cited
US2993445A
Cited
US3191853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |