US2633290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum pump with expanding liquid spiral
Assignee: Individual
•
Filing: 1950-05-13
•
Granted: 1953-03-31
•
Expires: 1970-05-13
Abstract
No abstract record available.
Inventors
- 👤 Henry G Schaefer
- 👤 Baumeister Philip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:21
CPC Classifications
F; F04; F04D; F04D1/00; F04D1/14; F04D1/12; F04D17/00; F04D17/08; F04D17/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1312707A
Cited
US743163A
Cited
US1074043A
Cited
US1220000A
Cited
US1842940A
Cited
US1946524A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |