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Hiroshi Ohtsuka — 21 Patents

GRGraphtec: 4 patents #5 of 62Top 9%
OCOki Electric Industry Co.: 3 patents #700 of 2,807Top 25%
Mitsubishi Electric: 2 patents #11,187 of 25,717Top 45%
MLMitsubishi Pencil Company, Limited: 2 patents #127 of 302Top 45%
TCToshiba Ceramics Co.: 1 patents #190 of 458Top 45%
KAKao: 1 patents #1,961 of 3,221Top 65%
LILuma Telecom Incorporated: 1 patents #6 of 12Top 50%
CHChisso: 1 patents #468 of 833Top 60%
Yokohama, JP: #4,819 of 49,234 inventorsTop 10%
Overall (All Time): #201,324 of 4,157,543Top 5%
21 Patents All Time
Hiroshi Ohtsuka has been granted 21 US patents while listed as an inventor at Graphtec. The first was granted in 1986 and the most recent in December 2025. Hiroshi Ohtsuka ranks #201,324 of 4,157,543 US inventors in our database (top 4.8%). Patent records list Hiroshi Ohtsuka in Yokohama, JP.

Patents per Year

Patents granted per year, 1986 to 2023Bar chart with a peak of 2 patents in 1990.peak 21986: 1 patents19861987: 1 patents1989: 1 patents19891990: 2 patents1991: 1 patents19911994: 1 patents1998: 1 patents19982003: 1 patents2006: 2 patents20062011: 1 patents2016: 2 patents20162018: 1 patents2022: 2 patents20222023: 1 patents2023

Issued Patents All Time

Showing 1–21 of 21 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
D1104142 Cutting plotter Takahisa Umezawa 2025-12-02
D1104140 Cutting plotter Takahisa Umezawa 2025-12-02
D1104141 Cutting plotter Takahisa Umezawa 2025-12-02
D977002 X-Y plotter for cutting Takahisa Umezawa 2023-01-31
D972006 X-Y plotter for cutting Takahisa Umezawa 2022-12-06
D951341 X-Y plotter for cutting Takahisa Umezawa 2022-05-10
9994066 Erasing implement and writing implement provided with erasing implement Sakae Hayao, Tsuyoshi Nishida 2018-06-12
9519255 Label printer Shinichi Sasaki, Susumu Shoji 2016-12-13
9409438 Writing instrument with erasing member — 2016-08-09
7995812 X-ray image processing system and method thereof — 2011-08-09
7079379 Cooling device high voltage electrical unit for motor of vehicle, and hybrid vehicle Hiroo Yamaguchi, Osamu Hasegawa, Toshiyuki Matsuoka, Koshiro Fuchibe, Kunio Hasegawa +1 more 2006-07-18 $379,000
7051825 Structure for installing high-voltage equipment component to vehicle Ritsuo Masui 2006-05-30 $474,000
6637629 Immersion nozzle Etuhiro Hasebe, Kouji Enomoto 2003-10-28
5705473 Nonionic powdery detergent composition containing an aluminosilicate builder and a silicon-containing oil absorbing carrier Mutsumi Kuroda, Hiroyuki Yamashita, Mikio Sakaguchi, Hiroyuki Kondo, Kouichi Hatano +1 more 1998-01-06
5342713 Phase shifting mask Kazutoshi Abe, Takashi Taguchi 1994-08-30 $17,000
5062435 Hair comb with absorbant pad — 1991-11-05
4962521 Apparatus for still picture video telephone apparatus and methods for transmitting and displaying still picture image for use therein Fumiaki Komatsu, Junichi Sakamoto, Hitoshi Fujimoto, Kazuyuki Saigusa, Akifumi Kabasawa +2 more 1990-10-09
4943994 Still picture picturephone communications system Yutaka Ueno, Lawrence D. Emmons, James S. Mackley 1990-07-24
4824254 Alignment marks on semiconductor wafers and method of manufacturing the marks Yoshio Itoh, Tadashi Nishimuro, Hisamitsu Mitsutomi 1989-04-25 $4,000
4640888 Alignment mark on a semiconductor and a method of forming the same Yoshio Itoh, Tadashi Nishimuro, Norio Moriyama 1987-02-03 $5,000
4564557 Thermoset acrylic resin composition for coating metallic materials and stainless steel coated with the composition Masuhito Ohgushi, Tsutomu Asaba, Hironobu Hoshi, Kenichi Goshokubo, Takeo Wakui +3 more 1986-01-14

Frequent Collaborators

Takahisa Umezawa6 shared
Tadashi Nishimuro2 shared
Yoshio Itoh2 shared
Kazutoshi Abe1 shared
Kunio Hasegawa1 shared
Lawrence D. Emmons1 shared

Nearby-Ranked Inventors

Subhash Sankuratripati21
Brian Riordan21
Woongki Min21
Jeremy Cailleteau21
Shigeru Chiba21
Cecilia Carbonelli21
Pin-Wen Chen21
Michael Danz21
Paul Kolen21