Granted Patent
Utility
US 4,496,797 · App. 06/537,234
Circuit for automatically connecting and disconnecting a speakerphone to a telephone line
Inventor:
John W. Price
Patented Case
View Patent ↗
Granted: Jan 29, 1985
Filed: Sep 29, 1983
Inventor
John W. Price
Assignee (at issue)
AT&T Technologies Incorporated
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.