Patents by Inventor Douglas B. Holmes

Douglas B. Holmes 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 and apparatus for preparing electrochemical cells
    Patent number: 6467156
    Abstract: A method of fabricating electrochemical cells and batteries wherein the successive anode and cathode layers are separated by a polymeric electrolyte layer having a protruding polymer edge around its perimeter which reduces the likelihood of inadvertent contact between the anode and cathode current collectors is provided. The polymer edge functions as a non-conducting physical barrier positioned between adjacent current collectors. An apparatus for preparing electrochemical cells is also disclosed.
    Type: Grant
    Filed: April 12, 1996
    Date of Patent: October 22, 2002
    Assignee: Valence Technology, Inc.
    Inventors: David A. Velasquez, Douglas B. Holmes, E. Lawrence Goglin
  • Method and apparatus for preparing electrochemical cells
    Patent number: 5746781
    Abstract: A method of fabricating electrochemical cells and batteries wherein the successive anode and cathode layers are separated by a polymeric electrolyte layer having a protruding polymer edge around its perimeter which reduces the likelihood of inadvertent contact between the anode and cathode current collectors is provided. The polymer edge functions as a non-conducting physical barrier positioned between adjacent current collectors. An apparatus for preparing electrochemical cells is also disclosed.
    Type: Grant
    Filed: April 12, 1996
    Date of Patent: May 5, 1998
    Assignee: Valence Technology, Inc.
    Inventors: David A. Velasquez, Douglas B. Holmes, E. Lawrence Gogolin
  • Apparatus and method of preparing electrochemical cells
    Patent number: 5690703
    Abstract: A method for removing plasticizers such dibutyl phthalate from the anode, cathode, and polymeric matrix components of electrochemical cell precursors using carbon dioxide in the supercritical state is provided. The method forms porous polymeric structures that enhances the mass transport of ions in the cell which results in improved electrochemical performance.
    Type: Grant
    Filed: March 15, 1996
    Date of Patent: November 25, 1997
    Assignee: Valence Technology, Inc
    Inventors: Porter H. Mitchell, David A. Velasquez, Ib I. Olsen, Douglas B. Holmes
  • Method of preparing electrochemical cells
    Patent number: 5670273
    Abstract: A method of fabricating electrochemical cells and batteries wherein the successive anode and cathode layers are separated by a polymeric electrolyte layer having a protruding polymer edge around its perimeter which reduces the likelihood of inadvertent contact between the anode and cathode current collectors is provided. The polymer edge functions as a non-conducting physical barrier positioned between adjacent current collectors.
    Type: Grant
    Filed: February 22, 1996
    Date of Patent: September 23, 1997
    Assignee: Valence Technology, Inc.
    Inventors: David A. Velasquez, Douglas B. Holmes, E. Lawrence Goglin
  • Method of preparing electrodes
    Patent number: 5616152
    Abstract: A method of fabricating electrodes suitable for use in electrochemical cells is provided. Each electrode has a perforated current collector and a tab which form an integral unit. The method can be adapted for batch, semi-continuous, or continuous fabrication of electrodes having electrode material laminated onto one or both surfaces of the current collector.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: April 1, 1997
    Assignee: Valence Technology, Inc.
    Inventors: David A. Velasquez, Douglas B. Holmes, E. Lawrence Gogolin