US2806431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid piston engine or liquid piston pump
Assignee: Individual
•
Filing: 1956-02-10
•
Granted: 1957-09-17
•
Expires: 1976-02-10
Abstract
No abstract record available.
Inventors
- 👤 Woydt Eduard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:31
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/04; F04B1/06; F04B1/07; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18208; Y10T74/19; Y10T74/1956
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1682570A
Cited
US2001336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |