Granted Patent
Utility
US 4,462,081 · App. 06/365,442
Signal processing system
Inventor:
Frank W. Lehan
Patented Case
View Patent ↗
Granted: Jul 24, 1984
Filed: Apr 5, 1982
Inventor
Frank W. Lehan
Assignee (at issue)
SYSTEM DEVELOPMENT INC.
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.