Patents Assigned to Hisao Sato
  • Conveyor roller with surface layer composed of matrix rubber and dispersed collagen fibers
    Patent number: 4724950
    Abstract: This invention concerns a transfer roller prepared by blending short collagen fibers in a rubber matrix for conveying plate-like materials sandwiched between paired rollers. By mixing collagen fibers mechanically in the rubber matrix with no addition of process oil or oil type reinforcing agent, conveyor rollers of a long operation life which show no reduction in the conveying function even when water or oil droplets are deposited to the rollers surface is obtained.
    Type: Grant
    Filed: March 12, 1986
    Date of Patent: February 16, 1988
    Assignee: Hisao Sato
    Inventor: Hiroshi Okamura
  • Speaker edge
    Patent number: 3980841
    Abstract: An acoustic material suitable for use as a speaker edge comprises an expanded plastic and minute collagen fibers wherein the content of the collagen fibers is 15 - 40% based on the weight of the expanded plastic and the length of the fibers is equal to or less than 1 mm.
    Type: Grant
    Filed: May 23, 1975
    Date of Patent: September 14, 1976
    Assignees: K.K. Fujita Shoten, Hisao Sato
    Inventors: Hiroshi Okamura, Hisao Sato, Isamu Iwasaki