Granted Patent
Utility
US 4,972,306 · App. 07/300,500
Compact variable diffuser for use in a luminaire
Inventor:
James Bornhorst
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Jan 23, 1989
Inventor
James Bornhorst
Assignee (at issue)
Vari-Lite, 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.