Inventor · disambiguated record
Shigeyasu Yamada
Also filed as: YAMADA SHIGEYASU
5 granted patents·99 citations·filing 1977–1989
82Inventor score
Files withNGK SPARK PLUG CO5
Top patents by PatentIndex Score
5 records- 0185US4092558ALong distance discharge gap type spark plugNGK SPARK PLUG CO·Filed 1977·Granted May 30, 1978·39 cites·3 claims
- 0276US4949006ASpark plug structureNGK SPARK PLUG CO·Filed 1989·Granted Aug 14, 1990·30 cites·7 claims
- 0358US5204579ACeramic insulator for spark plug structureNGK SPARK PLUG CO·Filed 1989·Granted Apr 20, 1993·17 cites·5 claims
- 0447US4288714ASpark plug for internal combustion engineNGK SPARK PLUG CO·Filed 1979·Granted Sep 8, 1981·7 cites·7 claims
- 0543US4336477ASpark plugNGK SPARK PLUG CO·Filed 1979·Granted Jun 22, 1982·6 cites·7 claims
Join the waitlist — get patent alerts
Get an alert when Shigeyasu Yamada files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →