Granted Patent
Utility
US 4,808,980 · App. 07/112,199
Electronic light pointer for a projection monitor
Inventor:
Donald E. Drumm
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Oct 22, 1987
Inventor
Donald E. Drumm
Assignee (at issue)
Wang Laboratories, 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.