Patents by Inventor Chris Krishnan

Chris Krishnan 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).

  • Method of manufacturing substrate for memory disk
    Patent number: 4829799
    Abstract: A method of manufacturing a substrate for a memory disk characterized in that a blank material comprising a non-magnetic metal substrate covered with a non-magnetic metal as an underlayer is subjected to a coining operation by two dies, i.e. upper and lower dies each having flat compressing surface and a certain kind of textured design formed thereon within an apparatus including a mandrel and a die ring arranged to limit the spreading extent of the material whereby a surface having ultra-preciseness and simultaneously impressed texture design is obtained.
    Type: Grant
    Filed: October 27, 1987
    Date of Patent: May 16, 1989
    Assignees: Furukawa Aluminum Co., Ltd., Kawasaki Steel Corp., C. Itoh & Co., Ltd.
    Inventors: Thomas U. Coe, Atsushi Yamazaki, Chris Krishnan
  • Method of manufacturing substrate for memory disk
    Patent number: 4823578
    Abstract: A method of manufacturing a substrate for a memory disk characterized in that a blank material comprising a non-magnetic metal substrate covered with a non-magnetic metal as an underlayer is subjected to a coining operation by two dies having flat compressing surfaces within an apparatus including a mandrel and a die ring arranged to limit the spreading extent of the material whereby a surface having ultra-preciseness is obtained.
    Type: Grant
    Filed: October 27, 1987
    Date of Patent: April 25, 1989
    Assignees: Furukawa Aluminum Co., Ltd., Kawasaki Steel Corp., C. Itoh & Co., Ltd.
    Inventors: Thomas U. Coe, Atsushi Yamazaki, Chris Krishnan