Granted Patent
Utility
US 4,390,309 · App. 06/262,539
Cradle pipe adaptor for magnetic drill
Inventor:
Michael Fangmann
Patented Case
View Patent ↗
Granted: Jun 28, 1983
Filed: May 11, 1981
Inventor
Michael Fangmann
Assignee (at issue)
Jancy Engineering 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.