Granted Patent
Utility
US 4,685,079 · App. 06/682,014
Ripple-borrow binary subtraction circuit
Inventor:
John Armer
Patented Case
View Patent ↗
Granted: Aug 4, 1987
Filed: Dec 14, 1984
Inventor
John Armer
Assignee (at issue)
RCA Corporation
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.