Granted Patent
Utility
US 4,641,339 · App. 06/716,438
Variable bandwidth handsfree telephone using switched capacitor filtering
Inventor:
William O. Stottlemyer
Patented Case
View Patent ↗
Granted: Feb 3, 1987
Filed: Mar 27, 1985
Inventor
William O. Stottlemyer
Assignee (at issue)
ITT Corporation
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.