Patents by Inventor Shohji Maruyama

Shohji Maruyama has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Optical recording medium
    Patent number: 6762008
    Abstract: An optical recording medium has a substrate, and a recording layer formed thereon which contains at least one formazan chelate compound of formula (I), (II) or wherein A, B, A′, B′, A1, A2, B1, B2, Z, Z1, Z2, M, p, and n are specified in the specification.
    Type: Grant
    Filed: March 21, 2002
    Date of Patent: July 13, 2004
    Assignee: Ricoh Company, Ltd.
    Inventors: Tsutomu Satoh, Shohji Maruyama, Tatsuya Tomura, Noboru Sasa, Yasunobu Ueno, Yasuhiro Higashi, Soh Noguchi
  • Optical recording medium
    Publication number: 20030068576
    Abstract: An optical recording medium has a substrate, and a recording layer formed thereon which contains at least one formazan chelate compound of formula (I), (II) or 1
    Type: Application
    Filed: March 21, 2002
    Publication date: April 10, 2003
    Inventors: Tsutomu Satoh, Shohji Maruyama, Tatsuya Tomura, Noboru Sasa, Yasunobu Ueno, Yasuhiro Higashi, Soh Noguchi
  • Optical recording medium
    Patent number: 6197477
    Abstract: An optical recording material including a substrate and a recording layer which is formed overlying the substrate, wherein the recording layer includes an azo chelate compound including an azo compound and at least one of a metal and a metal salt, and wherein the azo compound has the following formula (1):
    Type: Grant
    Filed: August 18, 1999
    Date of Patent: March 6, 2001
    Assignee: Ricoh Company, LTD
    Inventors: Tsutomu Satoh, Shohji Maruyama, Yasunobu Ueno, Tatsuya Tomura, Noboru Sasa, Yasuhiro Higashi