Assignee
NIPPON PISTON RING CO LTD
214 granted patents·28 pending applications·3,030 citations·filing 1973–2025
Top patents by PatentIndex Score
242 records- 0195US6139599AAbrasion resistant iron base sintered alloy material for valve seat and valve seat made of iron base sintered alloyNIPPON PISTON RING CO LTD·Filed 1999·Granted Oct 31, 2000·73 cites·18 claims
- 0295US4570316AMethod for manufacturing a rotor for a rotary fluid pumpNIPPON PISTON RING CO LTD·Filed 1985·Granted Feb 18, 1986·87 cites·6 claims
- 0393US9506138B2Piston ringNIPPON PISTON RING CO LTD·Filed 2015·Granted Nov 29, 2016·5 cites·8 claims
- 0492US10605374B2Valve seat insert excellent in wear resistance made of iron-base sintered alloy for internal combustion engines, and assembly of valve seat insert and valveNIPPON PISTON RING CO LTD·Filed 2017·Granted Mar 31, 2020·31 cites·11 claims
- 0592US6318327B1Valve system for internal combustion engineNIPPON PISTON RING CO LTD·Filed 2000·Granted Nov 20, 2001·44 cites·18 claims
- 0692US4419413APowder molding method and powder compression molded composite article having a rest-curve like boundaryNIPPON PISTON RING CO LTD·Filed 1982·Granted Dec 6, 1983·64 cites·38 claims
- 0791US4644912ACam shaft and method of manufactureNIPPON PISTON RING CO LTD·Filed 1985·Granted Feb 24, 1987·51 cites·12 claims
- 0890US5272930AMechanical element having a shaft pressure-fitted into an engaging member and its manufacturing methodNIPPON PISTON RING CO LTD·Filed 1992·Granted Dec 28, 1993·68 cites·16 claims
- 0990US4222575AShaft seal deviceNIPPON PISTON RING CO LTD·Filed 1979·Granted Sep 16, 1980·75 cites·7 claims
- 1089US7854191B2Three-piece oil ring and combination of the three-piece oil ring and pistonNIPPON PISTON RING CO LTD·Filed 2007·Granted Dec 21, 2010·24 cites·2 claims
- 1189US4243414ASlidable members for prime moversNIPPON PISTON RING CO LTD·Filed 1978·Granted Jan 6, 1981·30 cites·4 claims
- 1288US5419217AMachine element with at least a fitting member pressure-fitted on a shaft and method of making the sameNIPPON PISTON RING CO LTD·Filed 1993·Granted May 30, 1995·56 cites·20 claims
- 1386US9528606B2Combined oil ringNIPPON PISTON RING CO LTD·Filed 2013·Granted Dec 27, 2016·6 cites·3 claims
- 1486US6553957B1Combination of cylinder liner and piston ring of internal combustion engineNIPPON PISTON RING CO LTD·Filed 2000·Granted Apr 29, 2003·46 cites·9 claims
- 1585US10273838B2Valve seat insert for internal combustion engine having excellent wear resistanceNIPPON PISTON RING CO LTD·Filed 2016·Granted Apr 30, 2019·2 cites·14 claims
- 1685US5092361AInline type check valveNIPPON PISTON RING CO LTD·Filed 1990·Granted Mar 3, 1992·52 cites·7 claims
- 1784US7493882B2Combination of a cylinder liner and a piston ringNIPPON PISTON RING CO LTD·Filed 2007·Granted Feb 24, 2009·13 cites·4 claims
- 1884US7044472B2Combined steel oil control ringNIPPON PISTON RING CO LTD·Filed 2002·Granted May 16, 2006·25 cites·3 claims
- 1984US4198195ARotary fluid pump or compressorNIPPON PISTON RING CO LTD·Filed 1977·Granted Apr 15, 1980·34 cites·3 claims
- 2083US10287933B2Assembly of internal combustion engine valve and valve seatNIPPON PISTON RING CO LTD·Filed 2014·Granted May 14, 2019·5 cites·8 claims
- 2183US4969262AMethod of making camshaftNIPPON PISTON RING CO LTD·Filed 1990·Granted Nov 13, 1990·47 cites·4 claims
- 2283US4687185ATool for supporting a composite camshaft during sinteringNIPPON PISTON RING CO LTD·Filed 1986·Granted Aug 18, 1987·32 cites·12 claims
- 2382US10669613B2Titanium alloyNIPPON PISTON RING CO LTD·Filed 2017·Granted Jun 2, 2020·1 cites·1 claims
- 2482US5895517ASintered Fe alloy for valve seatNIPPON PISTON RING CO LTD·Filed 1997·Granted Apr 20, 1999·35 cites·8 claims
- 2582US4632074AWear-resistant member for use in internal combustion engine and method for producing the sameNIPPON PISTON RING CO LTD·Filed 1985·Granted Dec 30, 1986·27 cites·21 claims
- 2681US9803268B2Iron-base sintered alloy material for valve seat insert and method for manufacturing the sameNIPPON PISTON RING CO LTD·Filed 2015·Granted Oct 31, 2017·2 cites·18 claims
- 2781US5337872ASynchronizer ringNIPPON PISTON RING CO LTD·Filed 1992·Granted Aug 16, 1994·29 cites·10 claims
- 2881US4505988ASintered alloy for valve seatNIPPON PISTON RING CO LTD·Filed 1983·Granted Mar 19, 1985·33 cites·4 claims
- 2981US4093239APiston rod sealing arrangement for a stirling engineNIPPON PISTON RING CO LTD·Filed 1977·Granted Jun 6, 1978·38 cites·2 claims
- 3080US9863534B2Hard carbon coating filmNIPPON PISTON RING CO LTD·Filed 2014·Granted Jan 9, 2018·2 cites·8 claims
- 3180US6082317AValve seat for internal combustion engineNIPPON PISTON RING CO LTD·Filed 1998·Granted Jul 4, 2000·33 cites·8 claims
- 3280US5062730AUniversal jointNIPPON PISTON RING CO LTD·Filed 1990·Granted Nov 5, 1991·36 cites·3 claims
- 3380US4615310ACamshaft with lubricating oil supplying functionNIPPON PISTON RING CO LTD·Filed 1984·Granted Oct 7, 1986·26 cites·8 claims
- 3479US4345943AAbrasion resistant sintered alloy for internal combustion enginesNIPPON PISTON RING CO LTD·Filed 1980·Granted Aug 24, 1982·24 cites·8 claims
- 3579US4050855ADry air rotary pump or compressorNIPPON PISTON RING CO LTD·Filed 1976·Granted Sep 27, 1977·24 cites·6 claims
- 3678US11293548B2Sliding member and coating filmNIPPON PISTON RING CO LTD·Filed 2018·Granted Apr 5, 2022·2 cites·7 claims
- 3778US11111875B2Sliding structure for internal combustion engine, method for controlling idling operation, and method for controlling operation of internal combustion engineNIPPON PISTON RING CO LTD·Filed 2017·Granted Sep 7, 2021·2 cites·29 claims
- 3878US10578214B2Piston ring and manufacturing method thereforNIPPON PISTON RING CO LTD·Filed 2016·Granted Mar 3, 2020·1 cites·8 claims
- 3978US10428700B2Highly wear-resistant valve seat for use in internal combustion engineNIPPON PISTON RING CO LTD·Filed 2014·Granted Oct 1, 2019·3 cites·5 claims
- 4078US6860485B2Piston ringNIPPON PISTON RING CO LTD·Filed 2003·Granted Mar 1, 2005·22 cites·5 claims
- 4177US4315719ANon-lubricated rotary pump with discharge through end headsNIPPON PISTON RING CO LTD·Filed 1979·Granted Feb 16, 1982·14 cites·9 claims
- 4276US11047479B2Method for producing piston ring with recessNIPPON PISTON RING CO LTD·Filed 2019·Granted Jun 29, 2021·0 cites·17 claims
- 4376US4708029ACamshaftNIPPON PISTON RING CO LTD·Filed 1986·Granted Nov 24, 1987·27 cites·4 claims
- 4476US4648819AVane-type rotary compressor with rotary sleeveNIPPON PISTON RING CO LTD·Filed 1986·Granted Mar 10, 1987·24 cites·6 claims
- 4576US4595556AMethod for manufacturing camshaftNIPPON PISTON RING CO LTD·Filed 1985·Granted Jun 17, 1986·32 cites·4 claims
- 4676US4505485ARotary seal with linear wear resistant treated layerNIPPON PISTON RING CO LTD·Filed 1983·Granted Mar 19, 1985·26 cites·8 claims
- 4775US5324235ACardan-type universal jointNIPPON PISTON RING CO LTD·Filed 1992·Granted Jun 28, 1994·29 cites·10 claims
- 4875US4447275ACylinder linerNIPPON PISTON RING CO LTD·Filed 1982·Granted May 8, 1984·30 cites·22 claims
- 4973US4904302ARoller in rotary compressor and method for producing the sameNIPPON PISTON RING CO LTD·Filed 1988·Granted Feb 27, 1990·28 cites·3 claims
- 5073US4185842ASeal ringNIPPON PISTON RING CO LTD·Filed 1978·Granted Jan 29, 1980·40 cites·1 claims
Showing the top 50 of 242 patent records by PatentIndex Score.
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