Patents by Inventor J. Robert Dees

J. Robert Dees 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).

  • Battery separator
    Patent number: 6921608
    Abstract: The present invention is directed to a battery separator. The battery separator comprises a microporous film having a first portion and a second portion. The first portion is bonded to the second portion. The bond has a strength greater than 5 g/in. The film has a thickness less than 1.7 mils, a Gurley of less than 50 sec/10 cc, and a puncture strength of greater than 400 g/mil.
    Type: Grant
    Filed: August 21, 2002
    Date of Patent: July 26, 2005
    Assignee: Celgard, Inc.
    Inventors: Ronald W. Call, J. Robert Dees, Shizuo Ogura, Donald K. Simmons, Xiangyun Wei
  • Battery separator
    Publication number: 20030099877
    Abstract: The present invention is directed to a battery separator. The battery separator comprises a microporous film having a first portion and a second portion. The first portion is bonded to the second portion. The bond has a strength greater than 5 g/in. The film has a thickness less than 1.7 mils, a Gurley of less than 50 sec/10 cc, and a puncture strength of greater than 400 g/mil.
    Type: Application
    Filed: August 21, 2002
    Publication date: May 29, 2003
    Applicant: Celgard Inc.
    Inventors: Ronald W. Call, J. Robert Dees, Shizuo Ogura, Donald K. Simmons, Xiangyun Wei