US3545895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary inflow compressors and the like
Assignee: Calspan Corp
•
Filing: 1968-09-18
•
Granted: 1970-12-08
•
Expires: 1988-09-18
Abstract
No abstract record available.
Inventors
- 👤 Roger C Weatherston
- 👤 George R Duryea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:06
CPC Classifications
F; F04; F04C; F04C29/00; F04C29/12; F04C18/00; F04C18/08; F04C18/12; F04C18/14; F04C18/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1193808A
Cited
US1027091A
Cited
US1381949A
Cited
US1751843A
Cited
US2130054A
Cited
US2070631A
Cited
GB958489A
Cited
US3255630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-07 | 1974-06-08 | 1974-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-07 | 1978-06-08 | 1978-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-07 | 1982-06-08 | 1982-12-08 | $7700.00 | Window Closed / Lapsed |