Patents by Inventor Curtis Sprague

Curtis Sprague 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).

  • Sight glass
    Patent number: D527034
    Type: Grant
    Filed: July 27, 2005
    Date of Patent: August 22, 2006
    Assignee: Branham Corporation
    Inventor: Curtis Sprague
  • Sight glass
    Patent number: D529061
    Type: Grant
    Filed: July 27, 2005
    Date of Patent: September 26, 2006
    Assignee: Branham Corporation
    Inventor: Curtis Sprague
  • Sight glass
    Patent number: D538318
    Type: Grant
    Filed: July 27, 2005
    Date of Patent: March 13, 2007
    Assignee: Branham Corporation
    Inventor: Curtis Sprague
  • Sight glass
    Patent number: D538319
    Type: Grant
    Filed: July 27, 2005
    Date of Patent: March 13, 2007
    Assignee: Branham Corporation
    Inventor: Curtis Sprague
  • Sight glass
    Patent number: D538320
    Type: Grant
    Filed: July 27, 2005
    Date of Patent: March 13, 2007
    Assignee: Branham Corporation
    Inventor: Curtis Sprague