Granted Patent
Utility
US 5,442,389 · App. 07/997,985
Program server for interactive television system
Inventors:
Donald E. Blahut, Edward Stanley Szurkowski
Patented Case
View Patent ↗
Granted: Aug 15, 1995
Filed: Dec 28, 1992
Inventors
Donald E. Blahut
Edward Stanley Szurkowski
Assignee (at issue)
AT&T CORP.
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.