Granted Patent
Utility
US 5,001,439 · App. 07/368,483
Very low distortion amplifier
Inventors:
Douglas D. Lopata, Dale H. Nelson, Thayamkulangara R. Viswanathan
Patented Case
View Patent ↗
Granted: Mar 19, 1991
Filed: Jun 19, 1989
Inventors
Douglas D. Lopata
Dale H. Nelson
Thayamkulangara R. Viswanathan
Assignee (at issue)
AT&T Bell Laboratories
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.