US3890070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relative combination of an apex seal and a rotor housing in the rotary engine
Assignee: Nippon Piston Ring Co Ltd
•
Filing: 1973-08-03
•
Granted: 1975-06-17
•
Expires: 1993-08-03
Abstract
Abstract A layer of Fe-O compound having the thickness of more than 0.1 mm is formed on a sliding surface of an apex seal made from a ferrous or nonferrous metal by the spraying treatment. The oxygen content in the Fe-O compound is ranging from 15.0 wt.% to 30.05 wt.%. A hard layer having the Hv hardness of more than 650 is formed on the sliding surface of the rotor housing. Both said apex seal and rotor housing are combined with each other, intending to improve the wear and scuffing resistances of the sliding surface.
Inventors
- 👤 Takao Sasame
- 👤 Kentaro Takahashi
- 👤 Yoshikatsu Nakamura
- 👤 Kazumasa Miura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:22
CPC Classifications
F; F01; F01C; F01C19/00; F01C19/005; C; C23; C23C; C23C4/00; C23C4/04; C23C4/10; C23C4/11; F16; F16J; F16J9/00; F16J9/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A COMBINATION OF AN APEX SEAL AND A ROTOR HOUSING IN A ROTARY ENGINE, WHEREIN SAID APEX SEAL IS MADE FROM FERROUS OR NONFERROUS METAL AND HAVING MORE THAN 0.1 MM OF THE SLIDING SURFACE LAYER THEREOF FORMED BY SPRAYING FE-O COMPOUND CONTAINING OXYGEN 15.0 - 30.50 WEIGHT %, AND SAID ROTOR HOUSING HAS A HARD PLATED SLIDING SURFACE HAVING THE HV HARDNESS OF MORE THAN 650.
Claim 2
Dependent Claim
67 words
A COMBINATION OF AN APEX SEAL AND A ROTOR HOUSING IN A ROTARY ENGINE, WHEREIN SAID APEX SEAL IS MADE FROM FERROUS OR NONFERROUS METAL AND HAVING MORE THAN 0.1 MM OF THE SLIDING SURFACE LAYER THEREOF FORMED BY SPRAYING FE-O COMPOUND CONTAINING OXYGEN 15.0 - 30.50 WEIGHT %, AND SAID ROTOR HOUSING HAS A HARD PLATED SLIDING SURFACE HAVING THE HV HARDNESS OF MORE THAN 650.
References Cited (Backward Citations)
US2311240A
Cited
US3061525A
Cited
US3155311A
Cited
US3155313A
Cited
US3394877A
Cited
US3731941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |