Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Ryoichi Oka — 8 Patents

GRGraphtec: 6 patents #3 of 62Top 5%
Yokohama, JP: #12,186 of 49,234 inventorsTop 25%
Overall (All Time): #600,572 of 4,157,543Top 15%
8 Patents All Time
Ryoichi Oka has been granted 8 US patents while listed as an inventor at Graphtec. The first was granted in 1995 and the most recent in June 2022. Ryoichi Oka ranks #600,572 of 4,157,543 US inventors in our database (top 14.4%). Patent records list Ryoichi Oka in Yokohama, JP.

Patents per Year

Patents granted per year, 1995 to 2022Bar chart with a peak of 2 patents in 2019.peak 21995: 1 patents19952001: 1 patents20012014: 1 patents20142017: 1 patents20172018: 1 patents20182019: 2 patents20192022: 1 patents2022

Issued Patents All Time

Showing 1–8 of 8 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
D956134 Cutting plotter Takahisa Umezawa, Kazuhiro Watanabe 2022-06-28
10279503 Cutting pen, cutting plotter, and blade extension amount control method of cutting plotter Kazuhiro Watanabe, Tsutomu Ohira 2019-05-07
10173364 Control method of embossing apparatus Kazuhiro Watanabe, Tsutomu Ohira 2019-01-08
10011034 Cutting plotter Kazuhiro Watanabe 2018-07-03
D802657 Roll feeder for cutting plotter Takahisa Umezawa, Kazuhiro Watanabe 2017-11-14
D720395 Cutting plotter Takahisa Umezawa, Kazuhiro Watanabe 2014-12-30
6227236 Widely variable conductance valve Satoru Kusumoto 2001-05-08
5413139 Throttle valve Satoru Kusumoto 1995-05-09 $1,164,000