Granted Patent
Utility
US 5,488,409 · App. 08/122,794
Apparatus and method for tracking the playing of VCR programs
Inventors:
Henry C. Yuen, Daniel S. Kwoh
Patented Case
View Patent ↗
Granted: Jan 30, 1996
Filed: Sep 16, 1993
Inventors
Henry C. Yuen
Daniel S. Kwoh
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.