Patents by Inventor Takeshi Kanbara

Takeshi Kanbara 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).

  • Halogen-containing polymer and production method for same
    Patent number: 11555093
    Abstract: To provide a highly heat resistant flame retardant. A polymer having repeating units represented by the following formula (1), which has a weight average molecular weight as calculated as standard polystyrene of at least 6,000: wherein R is a C1-6 alkylene group, —S— or —SO2—.
    Type: Grant
    Filed: July 9, 2018
    Date of Patent: January 17, 2023
    Assignee: TOSOH CORPORATION
    Inventors: Takeshi Kanbara, Tomohiro Arita
  • HALOGEN-CONTAINING POLYMER AND PRODUCTION METHOD FOR SAME
    Publication number: 20200199296
    Abstract: To provide a highly heat resistant flame retardant. A polymer having repeating units represented by the following formula (1), which has a weight average molecular weight as calculated as standard polystyrene of at least 6,000: wherein R is a C1-6 alkylene group, —S— or —SO2—.
    Type: Application
    Filed: July 9, 2018
    Publication date: June 25, 2020
    Applicant: TOSOH CORPORATION
    Inventors: Takeshi KANBARA, Tomohiro ARITA
  • Benzofluorene compound and use thereof
    Patent number: 8993805
    Abstract: A novel material having high hole-transporting ability and a high glass transition temperature and having long-lasting durability is obtained. A benzofluorene compound represented by formula (1) is used. (In the formula, M is a substituted or unsubstituted aryl group having 6-40 carbon atoms or a substituted or unsubstituted heteroaryl group having 5-40 carbon atoms; Ar1 to Ar4 each independently is a substituted or unsubstituted aryl group having 6-40 carbon atoms or a substituted or unsubstituted heteroaryl group having 5-40 carbon atoms, provided that at least one of Ar1 to Ar4 is a substituent represented by any of the following formulae (2) to (5); and p is an integer of 0-2.
    Type: Grant
    Filed: April 12, 2007
    Date of Patent: March 31, 2015
    Assignee: Tosoh Corporation
    Inventors: Masakazu Nishiyama, Naoki Matsumoto, Takanori Miyazaki, Takeshi Kanbara
  • BENZOFLUORENE COMPOUND AND USE THEREOF
    Publication number: 20090184312
    Abstract: A novel material having high hole-transporting ability and a high glass transition temperature and having long-lasting durability is obtained. A benzofluorene compound represented by formula (1) is used. (In the formula, M is a substituted or unsubstituted aryl group having 6-40 carbon atoms or a substituted or unsubstituted heteroaryl group having 5-40 carbon atoms; Ar1 to Ar4 each independently is a substituted or unsubstituted aryl group having 6-40 carbon atoms or a substituted or unsubstituted heteroaryl group having 5-40 carbon atoms, provided that at least one of Ar1 to Ar4 is a substituent represented by any of the following formulae (2) to (5); and p is an integer of 0-2.
    Type: Application
    Filed: April 12, 2007
    Publication date: July 23, 2009
    Applicant: TOSOH CORPORATION
    Inventors: Masakazu Nishiyama, Naoki Matsumoto, Takanori Miyazaki, Takeshi Kanbara