TK

Takeshi Koyama

Canon: 38 patents #1,203 of 19,416Top 7%
MC Mitsubishi Gas Chemical Company: 27 patents #20 of 1,727Top 2%
Ricoh Company: 13 patents #1,714 of 9,818Top 20%
JT Jtekt: 11 patents #122 of 1,969Top 7%
JG Jgc: 7 patents #3 of 393Top 1%
KT Kabushiki Kaisha Toshiba: 6 patents #4,898 of 21,451Top 25%
KC Koyo Machine Industries Co.: 5 patents #1 of 86Top 2%
SI Seiko Instruments: 4 patents #389 of 1,437Top 30%
SS Sii Semiconductor: 3 patents #27 of 108Top 25%
FL Fujitsu Ten Limited: 3 patents #174 of 996Top 20%
SO Sony: 2 patents #12,963 of 25,231Top 55%
AB Ablic: 2 patents #65 of 167Top 40%
3M: 2 patents #5,326 of 11,543Top 50%
HI Hitachi: 1 patents #17,742 of 28,497Top 65%
TO Toshiba: 1 patents #1,121 of 2,688Top 45%
YA Yazaki: 1 patents #2,077 of 3,427Top 65%
CC Catalysts & Chemicals Industries Co.: 1 patents #56 of 128Top 45%
RK Riso Kagaku: 1 patents #321 of 551Top 60%
Overall (All Time): #8,906 of 4,157,543Top 1%
126
Patents All Time

Issued Patents All Time

Showing 101–125 of 126 patents

Patent #TitleCo-InventorsDate
5109154 Focus detection device having a plurality of means for forming light patterns provided at different distances from the optical axis Masaki Higashihara, Keiji Ohtaka, Kenji Suzuki, Yasuo Suda 1992-04-28
5089875 Semiconductor device with MIS capacitor 1992-02-18
5004935 Sample and hold circuit Akihiro Murayama 1991-04-02
4992819 Focus detecting device having a plurality of detecting areas and camera provided with the same Keiji Ohtaka, Yasuo Suda 1991-02-12
4975727 Focus detecting device Keiji Ohtaka 1990-12-04
4959677 Device for detecting the focus adjusted state of an objecting lens Yasuo Suda, Kazuhiko Arakawa, Keiji Ohtaka, Ichiro Ohnuki 1990-09-25
4949107 Camera having telescopic capability Nozomu Kitagishi, Sadatoshi Takahashi, Kouji Oizumi 1990-08-14
4922282 Optical apparatus for leading light fluxes transmitted through light dividing surface which is obliquely provided to focus detecting apparatus Keiji Ohtaka 1990-05-01
4907026 Light projection system for automatic focus detection Keiji Ohtaka 1990-03-06
4878078 Focus detecting device and method of making same Keiji Ohtaka, Yasuo Suda 1989-10-31
4859842 Multi-directional focus state detection apparatus Yasuo Suda, Ichiro Ohnuki, Akira Akashi, Akira Ishizaki, Keiji Ohtaka 1989-08-22
4849782 Focus detecting device Keiji Ohtaka 1989-07-18
4841326 Apparatus for detecting the focus adjusted state of an objective optical system Keiji Ohtaka 1989-06-20
4833313 Focus detecting apparatus having increased SNR by selectively varying or holding constant the number of signals from sensor arrays Akira Akashi, Akira Ishizaki, Yasuo Suda, Ichiro Ohnuki, Keiji Ohtaka 1989-05-23
4812869 Focus detecting apparatus Akira Akashi, Akira Ishizaki, Yasuo Suda, Ichiro Ohnuki, Keiji Ohtaka 1989-03-14
4801963 Focus detecting system Keiji Ohtaka 1989-01-31
4800410 Focus detecting apparatus for selecting the operating process in conformity with the contrast of an object Akira Akashi, Akira Ishizaki, Yasuo Suda, Ichiro Ohnuki, Keiji Ohtaka 1989-01-24
4792668 Apparatus for detecting focusing state of objective lens Akira Akashi, Akira Ishizaki, Yasuo Suda, Ichiro Ohnuki, Keiji Ohtaka 1988-12-20
4792669 Focus detecting device having two selectively movable lenses Ichiro Ohnuki, Yasuo Suda, Akira Ishizaki, Akira Akashi, Keiji Ohtaka 1988-12-20
4774539 Camera having a focus detecting apparatus Yasuo Suda, Kazuhiko Arakawa, Keiji Ohtaka, Ichiro Ohnuki 1988-09-27
4728785 Focus detecting device using adjustable inclined sensing means Ichiro Ohnuki, Yasuo Suda, Akira Ishizaki, Akira Akashi, Keiji Ohtaka 1988-03-01
4707103 Optical system of variable magnification Keiji Ikemori 1987-11-17
4699493 Focus detecting device Keiji Ohtaka 1987-10-13
4633291 High-gain semiconductor device with capacitive coupling 1986-12-30
4613490 Process for preparing silicon nitride, silicon carbide or fine powdery mixture thereof Takashi Suzuki, Takamasa Kawakami, Rieko Nakano, Kansei Izaki, Akira Mori +1 more 1986-09-23