Granted Patent
Utility
US 6,105,484 · App. 09/178,121
Lockout device for valve actuators
Inventors:
Gene Kalthoff, Doug J Tanner, Al Libke
Patented Case
View Patent ↗
Granted: Aug 22, 2000
Filed: Oct 23, 1998
Inventors
Gene Kalthoff
Doug J Tanner
Al Libke
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.