Patents by Inventor Shiegeo Hirano

Shiegeo Hirano 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).

  • Photothermographic material
    Patent number: 5869229
    Abstract: A photothermographic material contains a compound of formula (I): ##STR1## wherein X represents --N.dbd., --N(R)--, --O--or --S--wherein R represents hydrogen, hydroxy, aliphatic hydrocarbon, aryl or heterocyclic group, Z represents a valence bond or a group of non-metallic atoms necessary to form a 5 to 7-membered ring with X, and each of Q.sub.1 and Q.sub.2 represents a group of non-metallic atoms necessary to form an aromatic hydrocarbon ring or aromatic heterocycle fused to the ring completed by Z. The material has high sensitivity in the infrared region and a minimal sensitivity change with varying storage conditions.
    Type: Grant
    Filed: September 9, 1997
    Date of Patent: February 9, 1999
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hisashi Okada, Naoki Asanuma, Ryo Suzuki, Shiegeo Hirano