Granted Patent
Utility
US 4,954,931 · App. 07/216,750
Linear diffuse light source
Inventor:
William L. Hassler, Jr.
Patented Case
View Patent ↗
Granted: Sep 4, 1990
Filed: Jul 8, 1988
Inventor
William L. Hassler, Jr.
Assignee (at issue)
Parker-Hannifin Corporation
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.