Granted Patent
Utility
US 5,697,091 · App. 08/597,755
Distortion-free chopper-based signal mixer
Inventors:
Frank Hirschenberger, Richard Harris, John Elliott Whitecar
Patented Case
View Patent ↗
Granted: Dec 9, 1997
Filed: Feb 7, 1996
Inventors
Frank Hirschenberger
Richard Harris
John Elliott Whitecar
Assignee (at issue)
Ford Motor Company
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.