Patents by Inventor Yoshiaki Nakase

Yoshiaki Nakase 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).

  • Novel process for preparing oxymethylene polymer and resulting product
    Patent number: 3963676
    Abstract: Tetraoxane is polymerized by means of an electron acceptor substance used as polymerization initiator in the absence or presence of a saturated aliphatic carboxylic acid anhydride and/or an acetal, to obtain an oxymethylene polymer having thermal stability.An ionizing radiation or a light can, if desired, concomitantly be employed before and/or in the course of polymerization.
    Type: Grant
    Filed: July 18, 1974
    Date of Patent: June 15, 1976
    Assignee: Japan Atomic Energy Research Institute
    Inventors: Masaru Yoshida, Yoshiaki Nakase, Akihiko Ito
  • Process for preparing thermally stabilized oxymethylene polymer from trioxane with thiocyanate and radiation
    Patent number: 3930972
    Abstract: Trioxane can advantageously be polymerized in the presence of a thiocyanate (an ester of thiocyanic acid), to obtain an oxymethylene polymer having thermal stability. The polymerization is further promoted by means of an ionizing radiation or an ultraviolet light.
    Type: Grant
    Filed: September 10, 1973
    Date of Patent: January 6, 1976
    Assignee: Japan Atomic Energy Research Institute
    Inventors: Akihiko Ito, Masaru Yoshida, Yoshiaki Nakase, Tadafumi Yamauchi, Tadashi Iwai, Koichiro Hayashi