Patents by Inventor Bob Shirk

Bob Shirk 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).

  • Lead-acid battery
    Patent number: D718231
    Type: Grant
    Filed: November 5, 2012
    Date of Patent: November 25, 2014
    Assignee: NorthStar Battery Company, LLC
    Inventors: Steve Burns, John Hooke, John Semeniuk, Bob Shirk
  • Lead-acid battery
    Patent number: D718232
    Type: Grant
    Filed: November 5, 2012
    Date of Patent: November 25, 2014
    Assignee: NorthStar Battery Company, LLC
    Inventors: Steve Burns, John Hooke, John Semeniuk, Bob Shirk