Granted Patent
Utility
US 4,381,522 · App. 06/211,759
Selective viewing
Inventor:
Trevor Lambert
Patented Case
View Patent ↗
Granted: Apr 26, 1983
Filed: Dec 1, 1980
Inventor
Trevor Lambert
Assignee (at issue)
Adams-Russell Co. Inc.
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.