Patent US1912825A successfully refreshed from Google Patents.
Patent US3621759A successfully refreshed from Google Patents.
US3621759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure engine and valving system therefor
Assignee: THERMAD Inc
•
Filing: 1970-02-06
•
Granted: 1971-11-23
•
Expires: 1990-02-06
Abstract
Abstract THE INVENTION RELATES TO A VALVING SYSTEM FOR FLUID PRESSURE ENGINES, SUCH AS STEAM ENGINES, FEATURING THE UTILIZATION OF SPRING PRESSED CHECK VALVES, SUCH AS A BALL FOR CONTROLLING THE SUPPLY OF PRESSURED FLUID TO THE ENGINE EACH SUCH VALVE BEING PERIODICALLY ACTUATED TO AN OPEN POSITION BY A MOMENTARILY APPLIED IMPACT FORCE. THE INVENTION ALSO PROVIDES AN INEXPENSIVE CONSTRUCTION FOR A RELATIVELY SMALL FLUID PRESSURE ENGINE, PERMITTING THE UTILIZATION OF SUCH ENGINES IN APPLICATIONS SUCH AS DOMESTIC LAWN MOWERS, SMALL GARDEN TRACTORS, OR MARINE ENGINES.
Inventors
- 👤 Walter F Cousino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:52
CPC Classifications
F; F01; F01B; F01B15/00; F01B15/002; F03; F03C; F03C1/00; F03C1/02; F03C1/04; F03C1/0403; F03C1/0419; F03C1/0435
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |