Granted Patent
Utility
US 4,190,801 · App. 05/875,336
Digital encoding circuitry
Inventor:
Richard E. DeFreitas
Patented Case
View Patent ↗
Granted: Feb 26, 1980
Filed: Feb 6, 1978
Inventor
Richard E. DeFreitas
Assignee (at issue)
DeltaLab Research, 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.