Shiro Tsuda — 13 Patents at Ferrotec

Shiro Tsuda has been granted 13 US patents while listed as an inventor at Ferrotec. The first was granted in 1997 and the most recent in June 2010. Shiro Tsuda ranks #362,438 of 4,157,543 US inventors in our database (top 8.7%). Patent records list Shiro Tsuda in Chiba, JP.

Patents per Year

Issued Patents All Time

Showing 1–13 of 13 patents

Patent #	Title	Co-Inventors	Date
7729504	Ferrofluid centered voice coil speaker	Ronald E. Rosensweig	2010-06-01
7266214	Audio speaker and method for assembling an audio speaker	—	2007-09-04
7248714	Micro-speaker and method for assembling a micro-speaker	—	2007-07-24
7063802	Composition and method of making an element-modified ferrofluid	Koji Nemoto, Nobuharu Iijima, Nobuaki Kurihara	2006-06-20
6868167	Audio speaker and method for assembling an audio speaker	—	2005-03-15
6804368	Micro-speaker and method for assembling a micro-speaker	—	2004-10-12
6277298	Ferrofluid composition and process	Lucian Borduz, Yasutake Hirota	2001-08-21
6261471	Composition and method of making a ferrofluid having an improved chemical stability	Yasutake Hirota, Hisao Suzuki	2001-07-17
6056889	Process for producing a magnetic fluid and composition therefor	Kacey Wiley Heckman, Yasutake Hirota, Stefan Borduz, Lucian Borduz	2000-05-02
5879580	Ferrofluid having improved oxidation resistance	Mayumi Takayama	1999-03-09
5730893	Magnetic colloids using acid terminated poly (12-hydroxystearic acid) dispersants	John E. Wyman	1998-03-24
5676877	Process for producing a magnetic fluid and composition therefor	Stefan Borduz, Lucian Borduz	1997-10-14
5656196	Ferrofluid having improved oxidation resistance	Mayumi Takayama	1997-08-12