Granted Patent
Utility
US 4,820,002 · App. 07/124,614
Safety interlock
Inventors:
Lloyd Lechner, Kent Thomas
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Nov 24, 1987
Inventors
Lloyd Lechner
Kent Thomas
Assignee (at issue)
TAB Products 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.