US2469889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum pump
Assignee: General Electric Co
•
Filing: 1945-06-28
•
Granted: 1949-05-10
•
Expires: 1965-06-28
Abstract
No abstract record available.
Inventors
- 👤 Donald F Wilcock
- 👤 Edward G Chace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:53
CPC Classifications
F; F04; F04F; F04F9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2389802A
Cited
US1857508A
Cited
US2265962A
Cited
US2147488A
Cited
US2258222A
Cited
US2371050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-09 | 1952-11-08 | 1953-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-09 | 1956-11-08 | 1957-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-09 | 1960-11-08 | 1961-05-10 | $7700.00 | Window Closed / Lapsed |