Granted Patent
Utility
US 4,325,139 · App. 06/181,983
Circuit for combining delta modulated signals
Inventor:
Gilbert A. Van Dine
Patented Case
View Patent ↗
Granted: Apr 13, 1982
Filed: Aug 28, 1980
Inventor
Gilbert A. Van Dine
Assignee (at issue)
Bell Telephone Laboratories, 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.