Inventor · disambiguated record
Keizo Tatsumi
Also filed as: TATSUMI KEIZO
25 granted patents·138 citations·filing 1987–2019
95Inventor score
Top patents by PatentIndex Score
25 records- 0175USD374671SCombined speaker and amplifierYAMAHA CORP·Filed 1995·Granted Oct 15, 1996·19 cites·1 claims
- 0265USD310091SElectronic string instrumentYAMAHA CORP·Filed 1987·Granted Aug 21, 1990·10 cites·1 claims
- 0361USD597587SElectronic pianoYAMAHA CORP·Filed 2008·Granted Aug 4, 2009·13 cites·1 claims
- 0461US4890530AStringed musical instrumentYAMAHA CORP·Filed 1988·Granted Jan 2, 1990·15 cites·7 claims
- 0559USD692943SElectronic drum padTATSUMI KEIZO·Filed 2012·Granted Nov 5, 2013·11 cites·1 claims
- 0659USD394861SSpeaker boxYAMAHA CORP·Filed 1997·Granted Jun 2, 1998·10 cites·1 claims
- 0757USD366041SKaraoke music playerYAMAHA CORP·Filed 1994·Granted Jan 9, 1996·8 cites·1 claims
- 0855USRE37909EElectronic keyboard musical instrumentYAMAHA CORP·Filed 2000·Granted Nov 26, 2002·7 cites·0 claims
- 0954USD826316SWind instrumentYAMAHA CORP·Filed 2016·Granted Aug 21, 2018·6 cites·1 claims
- 1052USD397116SSpeaker boxYAMAHA CORP·Filed 1997·Granted Aug 18, 1998·7 cites·1 claims
- 1147USD711457SMuteYAMAHA CORPORTION·Filed 2013·Granted Aug 19, 2014·5 cites·1 claims
- 1245USD837284SPianoYAMAHA CORP·Filed 2017·Granted Jan 1, 2019·3 cites·1 claims
- 1344USD823375SWind instrumentYAMAHA CORP·Filed 2016·Granted Jul 17, 2018·3 cites·1 claims
- 1444US9583079B2Silencer for wind instrumentYAMAHA CORP·Filed 2014·Granted Feb 28, 2017·0 cites·14 claims
- 1544USD688737SElectronic drum padTATSUMI KEIZO·Filed 2012·Granted Aug 27, 2013·5 cites·1 claims
- 1642USD767016SElectric violinYAMAHA CORP·Filed 2015·Granted Sep 20, 2016·3 cites·1 claims
- 1740USD820901SMuteYAMAHA CORP·Filed 2016·Granted Jun 19, 2018·2 cites·1 claims
- 1840USD818034SMuteYAMAHA CORP·Filed 2016·Granted May 15, 2018·2 cites·1 claims
- 1938USD929494SWind instrumentYAMAHA CORP·Filed 2019·Granted Aug 31, 2021·1 cites·1 claims
- 2038USD929495SWind instrumentYAMAHA CORP·Filed 2019·Granted Aug 31, 2021·1 cites·1 claims
- 2138USD413917SElectronic keyboard musical instrumentYAMAHA CORP·Filed 1998·Granted Sep 14, 1999·3 cites·1 claims
- 2237USD405819SElectric percussion instrument with floppy disk playerYAMAHA CORP·Filed 1997·Granted Feb 16, 1999·3 cites·1 claims
- 2336USD839954SPianoYAMAHA CORP·Filed 2017·Granted Feb 5, 2019·1 cites·1 claims
- 2430USD893859SCase for wind instrumentYAMAHA CORP·Filed 2017·Granted Aug 25, 2020·0 cites·1 claims
- 2530USD865044SPiano performance controllerYAMAHA CORP·Filed 2018·Granted Oct 29, 2019·0 cites·1 claims
Join the waitlist — get patent alerts
Get an alert when Keizo Tatsumi 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 →