Patent Leaderboard
USPTO Patent Rankings Data through Sept 30, 2025
HY

Hiroshi Yamazaki — 401 Patents

KOKonica: 46 patents #4 of 1,958Top 1%
Tdk: 27 patents #163 of 3,796Top 5%
KMKonica Minolta: 26 patents #9 of 1,361Top 1%
Sony: 21 patents #1,931 of 25,231Top 8%
KSKyocera Document Solutions: 18 patents #115 of 1,545Top 8%
NTNTT: 18 patents #151 of 4,871Top 4%
HCHitachi Chemical Company: 16 patents #69 of 1,946Top 4%
NDNitto Denko: 16 patents #187 of 2,479Top 8%
SCSeikosha Co.: 15 patents #15 of 312Top 5%
Mitsubishi Electric: 14 patents #1,823 of 25,717Top 8%
KMKonica Minolta: 12 patents #175 of 2,718Top 7%
OCOhi Seisakusho Co.: 12 patents #7 of 196Top 4%
Kabushiki Kaisha Toshiba: 12 patents #2,533 of 21,451Top 15%
Fujitsu Limited: 10 patents #3,161 of 24,456Top 15%
Ricoh Company: 10 patents #2,244 of 9,818Top 25%
Nissan Motor Co.: 9 patents #795 of 8,689Top 10%
ENEnplas: 9 patents #32 of 255Top 15%
CHChisso: 8 patents #104 of 833Top 15%
NHNamiki Seimitsu Houseki: 7 patents #3 of 108Top 3%
MCMabuchi Motor Co.: 5 patents #19 of 228Top 9%
NCNippon Shokubai Co.: 5 patents #248 of 1,108Top 25%
HSHarmonic Drive Systems: 5 patents #31 of 147Top 25%
FCFuji Kiko Co.: 5 patents #22 of 208Top 15%
Canon: 5 patents #9,253 of 19,416Top 50%
AKAsahi Kasei Kabushiki Kaisha: 5 patents #67 of 1,220Top 6%
KCKonishiroku Photo Industry Co.: 5 patents #175 of 894Top 20%
SPSeiko Precision: 4 patents #31 of 173Top 20%
KMKyocera Mita: 4 patents #152 of 763Top 20%
UNUnknown: 3 patents #7,366 of 83,584Top 9%
KIKabushiki Kaisha Isowa: 3 patents #10 of 54Top 20%
LPLenovo (Singapore) Pte.: 3 patents #409 of 1,301Top 35%
ACAdamant Namiki Precision Jewel Co.: 3 patents #5 of 58Top 9%
YKYasuhiro Koike: 3 patents #5 of 25Top 20%
NCNagano Japan Radio Co.: 2 patents #9 of 49Top 20%
O2O2Micro: 2 patents #65 of 174Top 40%
NCNissan Shatai Co.: 2 patents #11 of 67Top 20%
Nec: 2 patents #5,510 of 14,502Top 40%
NCNavitime Japan Co.: 2 patents #8 of 16Top 50%
CUCarleton University: 2 patents #1 of 34Top 3%
Sumitomo Electric Industries: 2 patents #9,741 of 21,551Top 50%
Sharp Kabushiki Kaisha: 2 patents #5,184 of 10,731Top 50%
DCDainippon Pharmaceutical Co.: 2 patents #58 of 207Top 30%
IRInstitute Of Physical And Chemical Research: 2 patents #33 of 172Top 20%
KZKabushiki Kaisha Zuken: 2 patents #2 of 29Top 7%
MSMitsubishi Heavy Industries Thermal Systems: 2 patents #71 of 149Top 50%
FUFukuoka University: 2 patents #5 of 64Top 8%
ICIkeda Bussan Co.: 2 patents #63 of 235Top 30%
HCHidan Co.: 2 patents #5 of 17Top 30%
SCSumitomo Chemical: 1 patents #2,469 of 4,033Top 65%
AFAsahi Kasei Fibers: 1 patents #35 of 96Top 40%
CLCanadian Patents And Development Limited: 1 patents #88 of 449Top 20%
CPChisso Petrochemical: 1 patents #69 of 139Top 50%
DCDainippon Sumitomo Pharma Co.: 1 patents #107 of 256Top 45%
DKDenki Kagaku Kogyo: 1 patents #291 of 655Top 45%
FUFuji: 1 patents #263 of 422Top 65%
FCFuji Machine Mfg. Co.: 1 patents #140 of 245Top 60%
FUFujifilm: 1 patents #3,076 of 4,519Top 70%
FTFujitsu Display Technologies: 1 patents #84 of 137Top 65%
FLFujitsu Microelectronics Limited: 1 patents #212 of 624Top 35%
HRHagiwara Research: 1 patents #3 of 6Top 50%
JMJapan Electronic Materials: 1 patents #16 of 40Top 40%
JCJgc Catalysts And Chemicals: 1 patents #74 of 139Top 55%
JSJsp: 1 patents #80 of 134Top 60%
KCKoito Manufacturing Co.: 1 patents #610 of 1,047Top 60%
MCMaruzen Petrochemical Co.: 1 patents #83 of 174Top 50%
MMMitsubishi Mining: 1 patents #886 of 2,247Top 40%
NSNippon Sanso: 1 patents #107 of 243Top 45%
NENtt Electronics: 1 patents #160 of 358Top 45%
OCOki Electric Industry Co.: 1 patents #1,459 of 2,807Top 55%
OMOmron: 1 patents #1,808 of 3,089Top 60%
Pioneer: 1 patents #1,107 of 1,730Top 65%
RKRikagaku Kenkyusho: 1 patents #70 of 207Top 35%
SESeiko Epson: 1 patents #5,551 of 7,774Top 75%
SKSeiko Koki Kabushiki Kaisha: 1 patents #23 of 27Top 90%
ATAT&T: 1 patents #10,626 of 18,772Top 60%
TKTanaka Kikinzoku Kogyo K.K.: 1 patents #216 of 436Top 50%
Stanford University: 1 patents #2,251 of 5,197Top 45%
YAYamatake: 1 patents #76 of 243Top 35%
Overall (All Time): #631 of 4,157,543Top 1%
401 Patents All Time

Issued Patents All Time

Showing 276–300 of 401 patents

Patent #TitleCo-InventorsDate
6246596 Switching power supply 2001-06-12
6208685 Matched filter 2001-03-27
6198060 EL-combined sheet switch Koji Hirose 2001-03-06
6184402 Processes for the preparation of metallocene complexes Masato Nakano, Seiki Mitani, Jun Saito, Masato Harada, Mina Koyama 2001-02-06
6175191 Drive circuit for EL element 2001-01-16
6169051 Metallocene compounds, processes for the preparation thereof, catalyst components for olefin polymerization, and processes for the production of olefin polymers Seiki Mitani, Masato Nakano, Jun Saito, Keisuke Kimura 2001-01-02
6146794 Electron beam antistatic method using conductive pins for charge disipation 2000-11-14
6042978 Image-forming method Kaori Soeda, Yoshiaki Kobayashi, Meizo Shirose 2000-03-28
6038632 Interrupt control on SMM Manabu Koarai, Naonobu Fujiwara, Toshikazu Morisawa 2000-03-14
6027221 Surface light source device of side light type and mold for light guide plate employed in the device Tsuyoshi Ishikawa 2000-02-22
6018010 Polymer with high acid value from unsaturated carboxylic acid and vinyl monomer Kenji Minami, Youhei Murakami 2000-01-25
5999027 Phase compensating apparatus and delay controlling circuit 1999-12-07
5973507 Exclusive-or gate for use in delay using transmission gate circuitry 1999-10-26
5967637 Tapered light guide plate for surface light source device and method of making by injection molding via supplementary cavity Tsuyoshi Ishikawa 1999-10-19
5966106 Driving circuit for an electro-luminescence element 1999-10-12
5932568 6-methoxy-1H-benzotriazole-5-carboxamide derivatives and pharmaceutical compositions containing them Shiro Kato, Yoshimi Hirokawa, Toshiya Morie, Naoyuki Yoshida 1999-08-03
5917278 Electroluminescent display having increased luminescent area Yoshiaki Miyauchi 1999-06-29
5910423 Water soluble powered formulation of reagent mixture containing water-insoluble reagents, and process for their production Kouchi Matsumoto 1999-06-08
5863691 Toner for developing electrostatic latent image developer and method for producing image Shigenori Kouno, Michiaki Ishikawa, Mikio Kohyama 1999-01-26
5851713 Toner for developing an electrostatic latent image Kenji Hayashi, Mikio Koyama, Tomoe Kikuchi, Naohiro Hirose, Shinichi Suzuki +2 more 1998-12-22
5847590 Delay device and delay time measurement device using a ring oscillator 1998-12-08
5841307 Delay device and delay time measurement device using a ring oscillator 1998-11-24
5830617 Toner for developing an electrostatic latent image, Developer and a method of producing an image using the toner Mikio Koyama, Kenji Hayashi, Tomoe Kikuchi 1998-11-03
5827524 Antimicrobial polymer composition Zenji Hagiwara, Kazuo Kishimoto 1998-10-27
5802300 Audio video system Shigeo Tanaka, Noriko Kotabe, Kouichi Sugiyama, Makoto Sato, Akira Katsuyama +2 more 1998-09-01