Inventor · disambiguated record
Koujirou Yamashita
Also filed as: YAMASHITA KOUJIROU
8 granted patents·340 citations·filing 1987–1991
90Inventor score
Files withHITACHI LTD8
Top patents by PatentIndex Score
8 records- 0196US4880474AMethod and apparatus for operating vacuum cleanerHITACHI LTD·Filed 1987·Granted Nov 14, 1989·125 cites·9 claims
- 0290US4855652ASpeed control apparatus for a brushless direct current motorHITACHI LTD·Filed 1988·Granted Aug 8, 1989·93 cites·3 claims
- 0375US5294872AMethod and apparatus for operating vacuum cleanerHITACHI LTD·Filed 1990·Granted Mar 15, 1994·25 cites·7 claims
- 0472US5166585AMotor control apparatus for an electric vacuum cleanerHITACHI LTD·Filed 1991·Granted Nov 24, 1992·28 cites·33 claims
- 0571US4983895AMethod and apparatus for operating vacuum cleanerHITACHI LTD·Filed 1989·Granted Jan 8, 1991·25 cites·2 claims
- 0658US5050057APower source apparatusHITACHI LTD·Filed 1989·Granted Sep 17, 1991·19 cites·16 claims
- 0751US5075607AMethod and apparatus for operating vacuum cleanerHITACHI LTD·Filed 1990·Granted Dec 24, 1991·10 cites·8 claims
- 0850US4998034ALow speed high torque motor with production methodHITACHI LTD·Filed 1989·Granted Mar 5, 1991·15 cites·7 claims
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