Yuji Arai

Ricoh Company: 118 patents #21 of 9,818Top 1%

NS Nippon Steel: 30 patents #16 of 4,423Top 1%

TC Taiyo Yuden Co.: 18 patents #59 of 959Top 7%

NM Nippon Steel & Sumitomo Metal: 16 patents #15 of 1,491Top 2%

SI Sumitomo Metal Industries: 13 patents #12 of 1,462Top 1%

SO Sony: 5 patents #7,785 of 25,231Top 35%

NE Nec: 2 patents #5,510 of 14,502Top 40%

SC Sanyo Electric Co.: 1 patents #3,644 of 6,347Top 60%

NA Nanao: 1 patents #12 of 27Top 45%

UN Unknown: 1 patents #29,356 of 83,584Top 40%

UC Usui Co.: 1 patents #15 of 34Top 45%

Overall (All Time): #3,263 of 4,157,543Top 1%

202

Patents All Time

Issued Patents All Time

Showing 201–202 of 202 patents

Patent #	Title	Co-Inventors	Date
4940618	Optical information recording medium	Emiko Hamada, Yuaki Shin, Takashi Ishiguro	1990-07-10
4920359	Optical information recording medium having protective layer	Emiko Hamada, Yuaki Shin, Takashi Ishiguro	1990-04-24