Patents by Inventor Todd W. Campbell

Todd W. Campbell 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 position indicator for buried valves
    Patent number: 7549440
    Abstract: A valve position indicator is directly coupled to a valve shaft. The indicator has a gauge that directly indicates rotation of a valve shaft in a subterranean valve.
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: June 23, 2009
    Inventor: Todd W. Campbell