Granted Patent
Utility
US 4,950,913 · App. 07/341,224
Programmable timer power switch unit
Inventor:
David Kephart
Patented Case
View Patent ↗
Granted: Aug 21, 1990
Filed: Apr 21, 1989
Inventor
David Kephart
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.