Patents by Inventor Hirohumi Omura

Hirohumi Omura 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).

  • Interlayer film for laminated glass
    Patent number: 5340654
    Abstract: An interlayer film for laminated glass comprising laminated layers of at least one layer (A) which comprises a plasticizer and polyvinyl acetal resin for which the number of carbon atoms in the acetal group is 4, 5 or 6 and the mole ratio of the average amount of the ethylene groups bonded to acetyl groups is 8-30 mole % of the total amount of the main chain ethylene groups, and at least one layer (B) which comprises a plasticizer and polyvinyl acetal resin for which the number of carbon atoms in the acetal group is 3 or 4 and the mole ratio of the amount of the average ethylene groups bonded to acetyl groups is 4 mole % or less of the total amount of the main chain ethylene groups.
    Type: Grant
    Filed: March 18, 1993
    Date of Patent: August 23, 1994
    Assignee: Sekisui Kagaku Kogyo Kabushiki Kaisha
    Inventors: Naoki Ueda, Kenichi Asahina, Hirohumi Omura, Jiro Miyai