Assignee
KK RIKEN
JP66 patents
Top patents by PatentIndex Score
US10267421B2Apr 23, 2019
Seal ring
KK RIKEN11 citations75
US11933407B2Mar 19, 2024
Compression ring
KK RIKEN2 citations73
US9851006B2Dec 26, 2017
Taper-faced compression ring and wire therefor
KK RIKEN4 citations73
US9644738B2May 9, 2017
Combination of cylinder and piston ring
KK RIKEN3 citations71
US10584618B2Mar 10, 2020
Sintered valve seat
KK RIKEN4 citations68
US10344636B2Jul 9, 2019
Sintered valve seat and its production method
KK RIKEN2 citations68
US10006546B2Jun 26, 2018
Piston ring
KK RIKEN4 citations68
US10006547B2Jun 26, 2018
Piston ring and its production method
KK RIKEN2 citations68
US9834831B2Dec 5, 2017
High rigid spheroidal graphite cast iron
KK RIKEN2 citations68
US11168790B2Nov 9, 2021
Sliding member and piston ring
KK RIKEN4 citations67
US9822433B2Nov 21, 2017
Spheroidal graphite cast iron
KK RIKEN5 citations65
USD927574SAug 10, 2021
Spacer for internal combustion engines
KK RIKEN0 citations63
USD920408SMay 25, 2021
Piston ring for internal combustion engine
KK RIKEN0 citations63
US11946109B2Apr 2, 2024
Spheroidal graphite cast iron and method of producing spheroidal graphite cast iron, and vehicle undercarriage parts
KK RIKEN0 citations62
US11746903B2Sep 5, 2023
Piston ring and method for manufacturing same
KK RIKEN0 citations62
US10655208B2May 19, 2020
Sliding member and piston ring
KK RIKEN1 citations62
US12188564B2Jan 7, 2025
Piston ring, and method for manufacturing same
KK RIKEN0 citations61
US11512777B2Nov 29, 2022
Piston ring
KK RIKEN0 citations61
US10982767B2Apr 20, 2021
Piston ring
KK RIKEN1 citations58
US12535020B2Jan 27, 2026
Sliding member
KK RIKEN0 citations57
US10563548B2Feb 18, 2020
Sintered valve seat
KK RIKEN1 citations57
US10557551B2Feb 11, 2020
Combined oil control ring
KK RIKEN1 citations57
US10233793B2Mar 19, 2019
Valve seat of sintered iron-based alloy
KK RIKEN1 citations57
US10670147B2Jun 2, 2020
Sliding member and piston ring
KK RIKEN1 citations56
US10295058B2May 21, 2019
Piston ring
KK RIKEN1 citations56
US9657838B2May 23, 2017
Combined oil control ring
KK RIKEN4 citations56
US10428943B2Oct 1, 2019
Side rail
KK RIKEN1 citations55
US11333245B2May 17, 2022
Oil control ring and spacer expander
KK RIKEN0 citations53
US10508738B2Dec 17, 2019
Side rail
KK RIKEN1 citations53
US11821524B2Nov 21, 2023
Combination of cylinder and piston ring
KK RIKEN0 citations51
US10823288B2Nov 3, 2020
Sliding member and piston ring
KK RIKEN0 citations51
US9920836B2Mar 20, 2018
Piston ring for internal combustion engine
KK RIKEN1 citations51
US9410625B2Aug 9, 2016
Combined oil control ring
KK RIKEN1 citations51
US10100929B2Oct 16, 2018
Piston ring
KK RIKEN1 citations50
US10036472B2Jul 31, 2018
Sliding member and piston ring
KK RIKEN0 citations50
US10036345B2Jul 31, 2018
Combination of cylinder and piston ring
KK RIKEN1 citations50
US10352446B2Jul 16, 2019
Combined oil control ring
KK RIKEN0 citations49
US9506564B2Nov 29, 2016
Seal ring
KK RIKEN1 citations49
US11448317B2Sep 20, 2022
Side rail
KK RIKEN0 citations48
US10745784B2Aug 18, 2020
High rigid spheroidal graphite cast iron
KK RIKEN0 citations48
US10502319B2Dec 10, 2019
Piston ring and its production method
KK RIKEN0 citations48
US9709169B2Jul 18, 2017
Piston ring
KK RIKEN1 citations48
US9447879B2Sep 20, 2016
Piston ring
KK RIKEN0 citations47
US11300013B2Apr 12, 2022
Sliding member
KK RIKEN0 citations45
US10914380B2Feb 9, 2021
Piston and piston ring for internal combustion engine
KK RIKEN0 citations45
US10247306B2Apr 2, 2019
Combined oil control ring
KK RIKEN0 citations45
US10670146B2Jun 2, 2020
Piston ring for combustion engine
KK RIKEN1 citations44
US10119428B2Nov 6, 2018
Roller type rocker arm
KK RIKEN0 citations44
US9664281B2May 30, 2017
Piston ring sprayed coating, piston ring, and method for producing piston ring sprayed coating
KK RIKEN1 citations43
US11603129B1Mar 14, 2023
Vehicle knuckle
KK RIKEN0 citations42
Showing the top 50 of 66 patents by PatentIndex Score.