SK

Seiji Kumagai

SO Sony: 13 patents #3,381 of 25,231Top 15%
Sumitomo Electric Industries: 5 patents #5,365 of 21,551Top 25%
MC Mitsubishi Shindoh Co.: 2 patents #25 of 65Top 40%
DE Dexerials: 1 patents #248 of 387Top 65%
HC Hokkai Can Co.: 1 patents #39 of 86Top 50%
Overall (All Time): #192,325 of 4,157,543Top 5%
22
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
12068788 Receiver circuit for optical communication Yoshiyuki Sugimoto, Keiji Tanaka 2024-08-20
11486760 Receiving circuit and optical receiving circuit Yoshiyuki Sugimoto, Keiji Tanaka 2022-11-01
11405111 Receiving circuit and optical receiver Yoshiyuki Sugimoto 2022-08-02
11394352 Transimpedance amplifier circuit Yoshiyuki Sugimoto, Keiji Tanaka 2022-07-19
10436964 Inorganic polarizing plate, method of manufacturing the same, and optical instrument Akio Takada, Hideto Sagawa, Takahiro Kimura, Kazuyuki Shibuya, Toshiaki Sugawara +2 more 2019-10-08
8089716 Magnetic tape, magnetic tape apparatus, servo pattern recording apparatus, magnetic tape producing method, and magnetic tape recording method Jun Takayama 2012-01-03
6535364 Magnetic resistance element having four magnetization states and a magnetic device using the same Yoshito Ikeda, Terunobu Miyazaki, Yoshiyuki Fukumoto 2003-03-18
6519123 Method to manufacture magnetic tunneling elements using inductively coupled plasma Junichi Sugawara, Eiji Nakashio, Yoshito Ikeda 2003-02-11
6452892 Magnetic tunnel device, method of manufacture thereof, and magnetic head Junichi Honda, Yoshito Ikeda 2002-09-17
6365948 Magnetic tunneling junction device Toshihiko Yaoi, Yoshito Ikeda 2002-04-02
6312840 Magnetic tunneling element and manufacturing method therefor Eiji Nakashio, Junichi Sugawara, Yoshito Ikeda 2001-11-06
6219213 Magnetic head with magnetic tunnel element in which induced magnetic field changes relative angle of magnetization which affects tunnel current Kazuo Goto 2001-04-17
6213650 Method of making optical module Yutaka Moriyama, Sosaku Sawada 2001-04-10
6103406 Magnetic tunnel device 2000-08-15
5936815 Magnetic head Junichi Honda, Norikatsu Fujisawa, Kyu Kanno 1999-08-10
5867887 Manufacturing method for magnetic head Masatoshi Hayakawa, Yoshito Ikeda, Junichi Honda 1999-02-09
5737154 Rotary magnetic head apparatus with circuitry for driving head and circuitry for transmitting output signals in noncontact fashion disposed on rotary drums Masatoshi Hayakawa, Hiroshi Morita, Norikatsu Fujisawa, Junichi Honda, Yuji Nakano 1998-04-07
5667752 Copper alloy sheet for connectors and connectors formed of same Takeshi Suzuki, Rensei Futatsuka, Manpei Kuwahara 1997-09-16
5515222 Magnetic head core arrangement having medium facing surface sides formed of single-crystal ferrite Junichi Honda, Yoshitomo Ito, Masatoshi Hayakawa, Toru Matsunaga, Mineo Yorizumi +1 more 1996-05-07
5475551 Magnetic head Junichi Honda, Norikatsu Fujisawa, Masatoshi Hayakawa, Masahiro Kikkawa, Miho Suzuki 1995-12-12
4974716 Device for feeding can barrels Haruyuki Yuri, Isao Ibane 1990-12-04
4668471 Copper alloy lead material for leads of a semiconductor device Rensei Futatsuka, Masuhiro Izumida 1987-05-26