Granted Patent
Utility
US 4,623,980 · App. 06/709,358
Method of processing electrical signals by means of Fourier transformations
Inventor:
Peter Vary
Patented Case
View Patent ↗
Granted: Nov 18, 1986
Filed: Mar 8, 1985
Inventor
Peter Vary
Assignee (at issue)
Te Ka De Felten & Guilleaume Fernmeldeanlagen GmbH
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.