Granted Patent
Utility
US 4,908,852 · App. 07/300,796
Method and apparatus for altering the access format of telephone calls
Inventors:
John A. Hird, Lindsey D. Owen, Michael R. Rice
Patented Case
View Patent ↗
Granted: Mar 13, 1990
Filed: Jan 23, 1989
Inventors
John A. Hird
Lindsey D. Owen
Michael R. Rice
Assignee (at issue)
Intellicall, 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.