Granted Patent
Utility
US 4,596,499 · App. 06/535,414
Center-free drill
Inventors:
Michael Fangmann, Robert E. Strange, William C. McKay
Patented Case
View Patent ↗
Granted: Jun 24, 1986
Filed: Sep 26, 1983
Inventors
Michael Fangmann
Robert E. Strange
William C. McKay
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.