Patents by Inventor Tsutomu Koseki, deceased

Tsutomu Koseki, deceased 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).

  • Substrate produced by using alumina particles as an abrasive
    Patent number: 6146244
    Abstract: An abrasives composition comprises (i) one or more abrasives, (ii) one or more abrasion accelerators and (iii) water. The abrasive comprises intermediate alumina particles having a mean particle size of primary particles of 40 nm or less. The composition is used to produce a substrate by abrasion.
    Type: Grant
    Filed: November 10, 1998
    Date of Patent: November 14, 2000
    Assignee: Kao Corporation
    Inventors: Takeshi Atsugi, Manabu Shibata, Tsutomu Koseki, deceased
  • Abrasives composition, substrate and process for producing the same, and magnetic recording medium and process for producing the same
    Patent number: 5868604
    Abstract: An abrasives composition comprises (i) one or more abrasives, (ii) one or more abrasion accelerators and (iii) water. The abrasive comprises intermediate alumina particles having a mean particle size of primary particles of 40 nm or less.
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: February 9, 1999
    Assignee: Kao Corporation
    Inventors: Takeshi Atsugi, Manabu Shibata, Tsutomu Koseki, deceased