Patents by Inventor Tosio Higasihara

Tosio Higasihara 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).

  • Optical disc
    Patent number: 4911968
    Abstract: An optical recording disc which includes a pair of recording disc substrates opposed to each other with a space therebetween, with a hub situated at the central portion of the disc substrates so that there is formed the closed space between the disc substrates, thereby providing a dual sided recordable optical recording disc. The hub may be formed by a pair of hub halves. There is disposed an annular inner spacer and annular outer spacer around the hub so as to separate the pair of recording disc substrates.
    Type: Grant
    Filed: November 18, 1987
    Date of Patent: March 27, 1990
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Tosio Higasihara, Ken Yoshizawa, Masahiro Suzuki, Akira Gotoh, Yoshitane Tuburaya