Patents by Inventor Hiroko Morii

Hiroko Morii 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).

  • Magnetic particles for magnetic recording medium and process for producing the same
    Patent number: 5543069
    Abstract: Disclosed herein magnetic particles for magnetic recording which comprise acicular or plate-like magnetic particles and not less than 0.01 wt % (calculated as Al, SiO.sub.2 or Al and SiO.sub.2 and based on the acicular or plate-like magnetic particles) of an oxide or hydroxide containing Al, Si or both Al and Si and adhered to the surfaces of the acicular or plate-like magnetic particles, and which have not less than 0.50 of a molecular-weight-dependent parameter .alpha. represented by the following formula (I):As=K.sub.1 .multidot.M.sup..alpha. (I)wherein M represents a number-average molecular weight of a binder, As represents a saturation adsorption of said binder, and K.sub.1 represents a constant dependent on the binder and a solvent used for measuring As.
    Type: Grant
    Filed: July 31, 1995
    Date of Patent: August 6, 1996
    Assignee: Toda Kogyo Corporation
    Inventors: Kazuyuki Hayashi, Minoru Ohsugi, Hiroko Morii, Norio Sugita
  • Magnetic particles for magnetic recording medium and process for producing the same
    Patent number: 5484545
    Abstract: Disclosed herein magnetic particles for magnetic recording which comprise acicular or plate-like magnetic particles and not less than 0.01 wt % (calculated as Al, SiO.sub.2 or Al and SiO.sub.2 and based on the acicular or plate-like magnetic particles) of an oxide or hydroxide containing Al, Si or both Al and Si and adhered to the surfaces of the acicular or plate-like magnetic particles, and which have not less than 0.50 of a molecular-weight-dependent parameter .alpha. represented by the following formula (I):As=K.sub.1 .multidot.M.sup..alpha. (I)wherein M represents a number-average molecular weight of a binder, As represents a saturation adsorption of said binder, and K.sub.1 represents a constant dependent on the binder and a solvent used for measuring As.
    Type: Grant
    Filed: November 10, 1993
    Date of Patent: January 16, 1996
    Assignee: Toda Kogyo Corporation
    Inventors: Kazuyuki Hayashi, Minoru Ohsugi, Hiroko Morii, Norio Sugita