Patents by Inventor Hozumi Hirota

Hozumi Hirota 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).

  • Alloy magnetic recording head
    Patent number: 4811148
    Abstract: An iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy magnetic head is described. The magnetic head is filled between front gap forming surfaces (the front gap facing a magnetic tape) of a pair of Fe-Al-Si core pieces with non-magnetic ceramic films formed on the respective front gap forming surfaces and a glass film formed therebetween, and between rear gap forming surfaces for junction with an Ag-Cu-In series alloy film.
    Type: Grant
    Filed: March 10, 1987
    Date of Patent: March 7, 1989
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masaki Aoki, Masayuki Sakai, Hideo Torii, Hideyuki Okinaka, Hozumi Hirota
  • Magnetic recording medium
    Patent number: 4803133
    Abstract: A magnetic recording medium characterized in that a magnetic layer composed of the combination of oleic acid and ester, whereby it is better in the lubricating characteristics of the magnetic layer and in the abrasion resisting property of the magnetic layer, and superior in the durability in a wide temperature range.
    Type: Grant
    Filed: December 8, 1987
    Date of Patent: February 7, 1989
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hozumi Hirota, Yukihiro Shimasaki, Hideaki Komoda, Ikuo Ota
  • Permanent magnet materials
    Patent number: 3950194
    Abstract: Rare earth cobalt magnet materials, which comprised of cobalt, manganese, copper and 12 to 13 mole % of cerium and/or samarium are provided. These magnetic materials have improved magnetic characteristics, especially very high values of the maximum energy product.
    Type: Grant
    Filed: July 17, 1974
    Date of Patent: April 13, 1976
    Assignee: Matsushita Electrical Industrial Co., Ltd.
    Inventors: Hozumi Hirota, Yoshio Tawara