Granted Patent
Utility
US 6,321,381 · App. 09/558,536
Apparatus and method for improved parental control of television use
Inventors:
Henry C. Yuen, Roy J. Mankovitz, Daniel S. Kwoh
Patented Case
View Patent ↗
Granted: Nov 20, 2001
Filed: Apr 26, 2000
Inventors
Henry C. Yuen
Roy J. Mankovitz
Daniel S. Kwoh
Assignee (at issue)
Gemstar Development 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.