Granted Patent
Utility
US 4,808,047 · App. 07/100,721
Variable speed motor tapping attachment
Inventors:
Thomas J. Calevich, Lamont Hansen
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Sep 24, 1987
Inventors
Thomas J. Calevich
Lamont Hansen
Assignee (at issue)
Acme-Cleveland 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.