Granted Patent
Utility
US 4,809,270 · App. 07/150,489
Variable time slot communication system
Inventors:
Leslie A. Baxter, Paul Berkowitz
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Feb 11, 1988
Inventors
Leslie A. Baxter
Paul Berkowitz
Assignee (at issue)
AT&T Information Systems American Telephone and Telegraph Company
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.