Granted Patent
Utility
US 4,374,334 · App. 06/246,541
Signal comparator apparatus
Inventor:
William E. Engeler
Patented Case
View Patent ↗
Granted: Feb 15, 1983
Filed: Mar 23, 1981
Inventor
William E. Engeler
Assignee (at issue)
General Electric Company
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.