Granted Patent
Utility
US 5,535,949 · App. 08/450,795
Safety switch system for hydroblasting operations
Inventor:
Thomas B. Boisture
Patented Case
View Patent ↗
Granted: Jul 16, 1996
Filed: May 25, 1995
Inventor
Thomas B. Boisture
Assignee (at issue)
C.H. Heist Corp.
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.