Patents Assigned to Toshihiro Hirai
  • Polyurethane elastomer actuator
    Patent number: 5977685
    Abstract: A polyurethane elastomer actuator comprising a polyurethane elastomer 1 capable of deforming due to the orientation by an electric field, wherein the shrinkage displacement occurring at the time of the application of an electric field is transformed into other displacement. This polyurethane elastomer actuator does not require electrolyte and high voltage. Since it is not accompanied by chemical reactions and heat generation, its durability hardly deteriorates. This actuator deforms largely during driving.
    Type: Grant
    Filed: June 3, 1996
    Date of Patent: November 2, 1999
    Assignees: Nitta Corporation, Toshihiro Hirai
    Inventors: Yasushi Kurita, Tsutomu Ueda, Toshiaki Kasazaki, Toshihiro Hirai