Patents by Inventor David L. Martindale

David L. Martindale 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).

  • Valve
    Patent number: D301915
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: June 27, 1989
    Assignee: Cryolab, Inc.
    Inventors: Randall E. Fisher, David L. Martindale, Joseph H. Nichols
  • Valve
    Patent number: D301916
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: June 27, 1989
    Assignee: Cryolab, Inc.
    Inventors: Randall E. Fisher, David L. Martindale, Joseph H. Nichols