Granted Patent
Utility
US 5,370,149 · App. 08/165,937
Line blind valve
Inventors:
Curtis W. Clarkson, Larry F. Koll, Nicholas J. Williams
Patented Case
View Patent ↗
Granted: Dec 6, 1994
Filed: Dec 14, 1993
Inventors
Curtis W. Clarkson
Larry F. Koll
Nicholas J. Williams
Assignee (at issue)
The Clarkson Company
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.