Granted Patent
Utility
US 4,193,539 · App. 05/849,383
Signal generator
Inventors:
Rodney Virgil Bowman, Martin H. Francis
Patented Case
View Patent ↗
Granted: Mar 18, 1980
Filed: Nov 7, 1977
Inventors
Rodney Virgil Bowman
Martin H. Francis
Assignee (at issue)
NCR 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.