Patents by Inventor Katsuji Kuwamura

Katsuji Kuwamura 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).

  • Fluorene-type compound, photopolymerization initiator comprising said fluorene-type compound, and photosensitive composition containing said photopolymerization initiator
    Patent number: 9684238
    Abstract: According to an embodiment of the present invention, there is provided a novel fluorene-based compound and a photopolymerization initiator using the fluorene-based compound. The fluorene-based compound according to an embodiment of the present invention is represented by the general formula (1). A photopolymerization initiator having additionally high sensitivity can be provided by using the fluorene-based compound. In addition, a photopolymerization initiator that can impart additionally excellent characteristics can be provided by appropriately selecting, for example, a substituent.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: June 20, 2017
    Assignee: TOKYO OHKA KOGYO CO., LTD.
    Inventors: Makoto Harihara, Tomohiko Yamazaki, Katsuji Kuwamura
  • FLUORENE-TYPE COMPOUND, PHOTOPOLYMERIZATION INITIATOR COMPRISING SAID FLUORENE-TYPE COMPOUND, AND PHOTOSENSITIVE COMPOSITION CONTAINING SAID PHOTOPOLYMERIZATION INITIATOR
    Publication number: 20150259321
    Abstract: According to an embodiment of the present invention, there is provided a novel fluorene-based compound and a photopolymerization initiator using the fluorene-based compound. The fluorene-based compound according to an embodiment of the present invention is represented by the general formula (1). A photopolymerization initiator having additionally high sensitivity can be provided by using the fluorene-based compound. In addition, a photopolymerization initiator that can impart additionally excellent characteristics can be provided by appropriately selecting, for example, a substituent.
    Type: Application
    Filed: September 20, 2013
    Publication date: September 17, 2015
    Applicant: DAITO CHEMIX CORPORATION
    Inventors: Makoto Harihara, Tomohiko Yamazaki, Katsuji Kuwamura