Granted Patent
Utility
US 4,527,235 · App. 06/475,470
Subscriber terminal polling unit
Inventor:
Ronald J. Chebra
Patented Case
View Patent ↗
Granted: Jul 2, 1985
Filed: Mar 15, 1983
Inventor
Ronald J. Chebra
Assignee (at issue)
Base Ten Systems, Inc.
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.