Patents by Inventor Noriyo Nagumo

Noriyo Nagumo 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).

  • Patent number: 4997796
    Abstract: A kind of glass for magnetic head having a property of absorption of light and a property of adhesion in the molten state is produced as follows: CuO and Cr.sub.2 O.sub.3 are added to the glass of PbO-B.sub.2 O.sub.3 -SiO phase in order to increase the absorption rate from a laser beam. TeO.sub.2 is added in order to decrease the viscosity of the molten material and to increase the molten viscosity and the wettability to ceramics and ferrite which are bonded. It can be used in the fabrication of the magnetic head and the floating magnetic head. In particular the glass melts easily when irradiated by a xenon arc beam and other lasser beams.
    Type: Grant
    Filed: January 4, 1990
    Date of Patent: March 5, 1991
    Assignee: Alps Electric Co., Ltd.
    Inventors: Fumitoshi Toyoshima, Noriyo Nagumo