Patents by Inventor Takuo Nakahara

Takuo Nakahara 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).

  • Polyester films
    Patent number: 4101523
    Abstract: A polyester film is disclosed which comprises a polyester mainly consisting of polyethylene terephthalate and an additive amount of granular calcium terephthalate anhydride particles having a specific volume shape factor. The average particle diameter and additive amount of the granular calcium terephthalate anhydride particles may be controlled so that the film is particularly suitable as a metallized film or a condenser film.
    Type: Grant
    Filed: July 16, 1976
    Date of Patent: July 18, 1978
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Masamichi Watanabe, Takuo Nakahara, Seiji Sakamoto, Kunio Bizen, Akikazu Yano, Yuzo Otani
  • Polyester films useful as magnetic tapes
    Patent number: 4096109
    Abstract: A polyester film is disclosed which comprises (a) a polyester mainly consisting of polyethylene terephthalate which includes first inert particles being precipitated in the polyester-forming reaction system and having an average particle diameter of 1 to 3 microns and which shows a solution haze of 25 to 75% and (b) an additive amount of second inert substance particles which are added to said polyester (a) insoluble in said polyester (a), inert to the polyester-forming reaction and have an average particle diameter of 1 to 5 microns. The film is useful as a base of a magnetic tape.
    Type: Grant
    Filed: July 16, 1976
    Date of Patent: June 20, 1978
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Masamichi Watanabe, Takuo Nakahara, Seiji Sakamoto, Kunio Bizen, Akikazu Yano, Yuzo Otani