Patents by Inventor Victor S. C. Chang

Victor S. C. Chang 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: 5389433
    Abstract: A battery separator composed of a microporous sheet product having first and second major surfaces and a thickness of less than about 50 mils, formed from a uniform mixture of a polysulfone polymer and a filler or polysulfone polymer and structure enhancing agent, said sheet product having a fibrous sheet embedded within said mixture and between the first and second major surfaces. The porosity of the sheet product is at least about 60 volume percent composed of pores such that the average pore diameter increases from each major surface toward the interior of the sheet product's thickness.
    Type: Grant
    Filed: April 1, 1993
    Date of Patent: February 14, 1995
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Victor S. C. Chang, Richard C. Hartwig, James K. Kung, Joseph T. Lundquist, Marc E. Parham, James A. Avtges, Anthony J. Laccetti
  • Microporous polyurethane based battery separator
    Patent number: 5346788
    Abstract: A battery separator composed of a microporous sheet product having first and second major surfaces and a thickness of less than about 50 mils, formed from a uniform mixture of a thermoplastic polyurethane polymer having a high degree of hard segments with a filler or said polyurethane with a structure enhancing agent, said sheet product having a sheet embedded within said mixture and between the first and second major surfaces. The sheet product has porosity of at least about 50 volume percent composed of pores such that the nominal pore diameter increases from each major surface towards the interior, center of the sheet product's thickness.
    Type: Grant
    Filed: April 1, 1993
    Date of Patent: September 13, 1994
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Victor S. C. Chang, Richard C. Hartwig, Joseph T. Lundquist, Marc E. Parham, Anthony J. Laccetti