Patents by Inventor Hidetoshi Urashima

Hidetoshi Urashima 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).

  • Polarizing film: polymer film base containing substituted anthraquinone dichroic dye
    Patent number: 4840640
    Abstract: A polarizing film which comprises a film base having thereon an anthraquinone dye of general formula (I): ##STR1## wherein R.sup.1 and R.sup.2 each represents a hydrogen atom, an alkyl group, an alkoxy group, an aralkyloxy group, an aryl group, a cyclohexyl group, a 4-alkylcyclohexyl group, a carboxylic acid ester group, a carboxylic acid amide group, a halogen atom, ##STR2## X represents an oxygen atom, a sulfur atom or an amino group.
    Type: Grant
    Filed: June 16, 1987
    Date of Patent: June 20, 1989
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Konoe Miura, Tetsuo Ozawa, Seigo Okumura, Hidetoshi Urashima