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Tetsuyuki Doi — 29 Patents

RYRyobi: 25 patents #7 of 309Top 3%

TCTaiyo Electric Ind. Co.: 2 patents #2 of 9Top 25%

Fukuyama, JP: #9 of 471 inventorsTop 2%

Overall (All Time): #127,851 of 4,157,543Top 4%

29 Patents All Time

Tetsuyuki Doi has been granted 29 US patents while listed as an inventor at Ryobi. The first was granted in 1980 and the most recent in December 2025. Tetsuyuki Doi ranks #127,851 of 4,157,543 US inventors in our database (top 3.1%). Patent records list Tetsuyuki Doi in Fukuyama, JP.

Patents per Year

Issued Patents All Time

Showing 1–25 of 29 patents

Patent #	Title	Co-Inventors	Date
12494189	Sound absorption device	Tatsuya Goto, Akihiko Enamito, Keiki Nagai, Osamu Nishimura, Takahiro Hiruma +1 more	2025-12-09
D602793	Flowmeter	Nobuaki Nakamoto	2009-10-27
D530168	Soldering iron	Tomohiro Shigekawa	2006-10-17
D341155	Offset printing machine	Yutaka Fujii	1993-11-09
D332797	Offset printing machine	Takahiko Shinmoto	1993-01-26
D332464	Offset printing machine	Hideo Aoyama, Katsushi Hirokawa	1993-01-12
D324876	Offset printing machine	Kenso Maehara	1992-03-24
D324696	Offset printing machine	Koji Ishii	1992-03-17
D324537	Offset printing machine	Kenso Maehara	1992-03-10
D324538	Offset printing machine	Kenso Maehara	1992-03-10
D323844	Offset printing machine	Yusaku Kitamura	1992-02-11
D321000	Offset printing machine	Yusaku Kitamura	1991-10-22
D302173	Numbering machine	Kenso Maehara	1989-07-11
D300842	Fishing reel	Masaharu Nouma	1989-04-25
D300843	Fishing reel	Etsuo Hiraishi	1989-04-25
D300055	Fishing reel	Etsuo Hiraishi	1989-02-28
D299849	Fishing reel	Etsuo Hiraishi	1989-02-14
D290966	Printing machine	Toshiaki Saito, Koji Ishii	1987-07-21
D287814	Electric drill	Etsuo Hiraishi, Hiroshi Morikawa	1987-01-20
D284546	Cutter	Hideki Kawakami	1986-07-08
D281663	Circular saw	Hitoshi Tsuru	1985-12-10
D261411	Fishing rod grip	Takeshi Shohoji	1981-10-20
D260804	Fishing reel	Masakazu Sakamoto	1981-09-15
D259205	Fishing spinning reel	Takeshi Shohoji	1981-05-12
D258977	Fishing rod grip	Masakazu Sakamoto	1981-04-21