Patent US4872431A successfully refreshed from Google Patents.
US4872431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine with ceramics valves
Assignee: Niterra Co Ltd
•
Filing: 1988-04-27
•
Granted: 1989-10-10
•
Expires: 2008-04-27
Abstract
Abstract An internal combustion engines comprises at least one exhaust valve made of ceramics per each engine cylinder and a pluarality of intake valves made of steel. The relation in number and valve head diameter between the intake and exhaust valves is designed so as to give Pe<Pi and De>Di where Pe is the number of exhaust valves per each engine cylinder, Pi is the number of intake valve per each engine cylinder, De is the valve head diameter of the exhaust valves and Di is the valve head diameter of the intake valve.
Inventors
- 👤 Shigeaki Akao
- 👤 Noboru Ishida
- 👤 Mitsuyoshi Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:29
CPC Classifications
F; F01; F01L; F01L3/00; F01L3/02; F01L1/00; F01L1/26; F02; F02B; F02B2275/00; F02B2275/20; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02F2001/244; F02F2001/245
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
An internal combustion engine comprising: at least one exhaust valve made of ceramics per each cylinder; and a plurality of intake valves made of metal per each cylinder; wherein the relation in number and valve head diameter between said intake and exhaust valves are designed so as to give Pe<Pi and De>Di where Pe is the number of said exhaust valves per each cylinder, Pi is the number of said intake valve per each cylinder, De is the valve head diameter of said exhaust valves and Di is the valve head diameter of said intake vavle.
Claim 2
Dependent Claim
96 words
An internal combustion engine comprising: at least one exhaust valve made of ceramics per each cylinder; and a plurality of intake valves made of metal per each cylinder; wherein the relation in number and valve head diameter between said intake and exhaust valves are designed so as to give Pe<Pi and De>Di where Pe is the number of said exhaust valves per each cylinder, Pi is the number of said intake valve per each cylinder, De is the valve head diameter of said exhaust valves and Di is the valve head diameter of said intake vavle.
Claim 3
Dependent Claim
137 words
An internal combustion engine comprising: at least one exhaust valve made of ceramics per each cylinder; a plurality of intake valves made of metal per each cylinder; a cam shaft with cams; and a rocker arm; said exhaust valves being driven directly by said cams of said cam shaft; said intake valves being driven by said cams of said cam shaft by way of said rocker arm; wherein the relation in number of valve head diameter between said intake and exhaust valves are designed so as to give Pe <Pi and De >Di where Pe is the number of said exhaust valves per each cylinder, Pi is the number of said intake valves per each cylinder, De is the valve head diameter of said exhaust valves and Di is the valve head diameter of said intake valves.
Claim 4
Dependent Claim
137 words
An internal combustion engine comprising: at least one exhaust valve made of ceramics per each cylinder; a plurality of intake valves made of metal per each cylinder; a cam shaft with cams; and a rocker arm; said exhaust valves being driven directly by said cams of said cam shaft; said intake valves being driven by said cams of said cam shaft by way of said rocker arm; wherein the relation in number of valve head diameter between said intake and exhaust valves are designed so as to give Pe <Pi and De >Di where Pe is the number of said exhaust valves per each cylinder, Pi is the number of said intake valves per each cylinder, De is the valve head diameter of said exhaust valves and Di is the valve head diameter of said intake valves.
References Cited (Backward Citations)
AT84685B
Cited
GB967697A
Cited
DE1476045A1
Cited
US4385598A
Cited
US4530322A
Cited
US4660529A
Cited
US4519364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-09 | 1993-04-10 | 1993-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-09 | 1997-04-10 | 1997-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-09 | 2001-04-10 | 2001-10-10 | $7700.00 | Window Closed / Lapsed |