Inventor

Makoto Yamagishi

Inventor

Tokyo, JP

Overview

1987–2014

Patent span

Electricity

Primary field (CPC H)

Patents· 24 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

H04Rprimary

H04RLoudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers88%

G01MTesting static or dynamic balance of machines or structures8%

H04SStereophonic systems4%

PatentTitleYear

8,913,772'Ear speaker device'2014 8,885,865'Earphone'2014 8,660,288'Twin driver earphone'2014 8,538,059'Ear speaker device'2013 8,254,613'Speaker apparatus'2012 8,213,632'Electroacoustic transducer and ear speaker device'2012 8,175,316'Ear speaker device'2012 7,184,562'Loudspeaker apparatus'2007 6,356,643'Electro-acoustic transducer'2002 6,307,943'Electro-acoustic transducer and housing'2001 6,175,637'Acoustic transducer'2001 6,057,659'Speaker apparatus'2000 6,035,052'Acoustic transducer'2000 5,835,612'Speaker apparatus'1998 5,802,194'Stereo loudspeaker system with tweeters mounted on rotatable enlongated arms'1998 5,459,290'Acoustic transducer and acoustic transducing system'1995 5,115,473'Transducer having two ducts'1992 5,048,092'Electroacoustic transducer apparatus'1991 4,981,194'Electro-acoustic transducer'1991 4,965,838'Ear piece transducer'1990 4,742,887'Open-air type earphone'1988 4,727,748'Method and apparatus for detecting leaks in a gas pipe line'1988 4,651,559'Method and apparatus for detecting leaks in a gas pipe line'1987 4,646,872'Earphone'1987

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1987–2014Patents assigned to SONY CORP (20)· patent assignee history

1987–2014Based in Tokyo, JP· patent location history

1987–1988Based in Kawasaki, JP· patent location history

2012–2014Patents assigned to YAMAGISHI MAKOTO (7)· patent assignee history

2012–2013Patents assigned to SEKI HIDEKI (3)· patent assignee history

2012–2014Patents assigned to YAMAGUCHI YUKIMASA (3)· patent assignee history

2012–2013Patents assigned to HARA TAKESHI (2)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
SONY CORP	20	1987–2014
YAMAGISHI MAKOTOself	7	2012–2014
SEKI HIDEKI	3	2012–2013
YAMAGUCHI YUKIMASA	3	2012–2014
HARA TAKESHI	2	2012–2013

Locations

Location	Patents	Span
Tokyo, JP	22	1987–2014
Kawasaki, JP	2	1987–1988