Patent US4956769A successfully refreshed from Google Patents.
US3552121A
Expired / Lapsed
US
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Means for preventing reverse water flow through exhaust pipe of a rotary piston type marine engine
Assignee: Yanmar Co Ltd
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Filing: 1968-12-04
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Granted: 1971-01-05
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Expires: 1988-12-04
Abstract
Abstract A REVERSE WATER FLOW ARRESTER FOR A WANKEL TYPE ROTARY PISTON ENGINE HAVING AN EXHAUST PIPE WITH ONE END CONNECTED WITH AN EXHAUST WORKING CHAMBER OF THE ENGINE AND THE OTHER END INSERTED INTO WATER FOR DISCHARGING EXHAUST GAS THEREINTO, SAID ARRESTER COMPRISING A VACUUM VALVE FOR RELIEVING NEGATIVE PRESSURE CREATED DURING ENGINE START WITHIN SAID ENGINE EXHAUST WORKING CHAMBER IN ORDER TO PREVENT THE WATER TAKEN INTO THE ENGINE DUE TO THE NEGATIVE PRESSURE, AND MEANS FOR INTERCONNECTING THE VACUUM VALVE WITH ENGINE STARTING MEANS TO OPEN SAID VALVE DURING ENGINE START.
Inventors
- 👤 Kenichi Kitagawa
- 👤 Akira Kadono
- 👤 Rikichi Homura
- 👤 Mitsuhiro Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:44
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/12; Y; Y10; Y10S; Y10S60/00; Y10S60/901
Claims Analysis
Total Claims: 0
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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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |