Granted Patent
Utility
US 4,787,941 · App. 06/880,437
Cleaning method for keyboard assemblies
Inventor:
Joseph P. LaPlaca
Patented Case
View Patent ↗
Granted: Nov 29, 1988
Filed: Jun 30, 1986
Inventor
Joseph P. LaPlaca
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.