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| Number | Title | Issue Date |
| 4962732 | Valve operating device for internal combustion engine A valve operation mode changing system for the intake or exhaust valves of an internal combustion engine is controlled in response to engine speed and temperature of the working oil utilized in the system in such a way as to permit the valve operating mod... | 10/16/1990 |
| 4907550 | Apparatus for changing operation timing of valves for internal combustion engine Valve operating apparatus is disclosed in which intake or exhaust valves for an internal combustion engine are operated by rocker arms driven by cams and have a hydraulically operated coupling mechanism for selectively connecting or disconnecting adjacent... | 03/13/1990 |
| 4869214 | Valve operating mechanism for internal combustion engine A valve operating mechanism for operating a plurality of valves of a particular cylinder of an internal combustion engine includes a camshaft rotatable in synchronism with rotation of the internal combustion engine and having at least one cam. At least on... | 09/26/1989 |
| 4793296 | Valve operating mechanism for internal combustion engine A valve operating mechanism for operating a single valve of a particular cylinder of an internal combustion engine includes a camshaft rotatable in synchronism with rotation of the internal combustion engine and having at least one cam, and a plurality of... | 12/27/1988 |
| 4790274 | Valve operating mechanism for internal combustion engine A valve operating mechanism for operating a plurality of valves of a particular cylinder of an internal combustion engine includes a camshaft rotatable in synchronism with rotation of the internal combustion engine and having at least one cam. At least on... | 12/13/1988 |
| 4788946 | Valve operating mechanism for internal combustion engine A valve operating mechanism for operating a plurality of valves of an internal combustion engine includes a camshaft rotatable in synchronism with rotation of the internal combustion engine and having an array of three cams including a high-speed cam posi... | 12/06/1988 |
| 4741297 | Valve operating mechanism for internal combustion engine A valve operating mechanism for operating at least one valve of an internal combustion engine, includes a camshaft rotatable in synchronism with rotation of the internal combustion engine and having a pair of low- and high-speed cams of different cam prof... | 05/03/1988 |
| 4727830 | Valve operating mechanism for internal combustion engine A valve operating mechanism includes a camshaft rotatable in synchronism with rotation of an internal combustion engine and having a plurality of cams of different cam profiles. First, second, and third rocker arms are held in sliding contact with the cam... | 03/01/1988 |
| 4727831 | Valve operating mechanism for internal combustion engine A valve operating mechanism for operating a pair of valves of an internal combustion engine, includes a camshaft rotatable in synchronism with rotation of the internal combustion engine and having a first low-speed cam, a second low-speed cam, and a high-... | 03/01/1988 |
