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Patents Grantslast 30 patents

Information Patent Grant
Ring groove for oil ring with coil expander of piston
- Patent number 6,682,078
- Issue date Jan 27, 2004
- Nippon Piston Ring Co., Ltd.
- Hideshi Hitosugi
- F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
Information Patent Grant
Ring groove for oil ring with coil expander of piston
- Patent number 6,547,251
- Issue date Apr 15, 2003
- Nippon Piston Ring Co., Ltd.
- Hideshi Hitosugi
- F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...

Patents Applicationslast 30 patents

Information Patent Application
Ring groove for oil ring with coil expander of piston
- Publication number 20020174768
- Publication date Nov 28, 2002
- Nippon Piston Ring
- Hideshi Hitosugi
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...