Granted Patent
Utility
US 6,623,220 · App. 09/943,069
Quick change mandrel assembly for use with a hole saw and a pilot drill bit
Inventors:
Bart Andrew Nuss, Gregory A. Phillips, Richard L. Hall, Kevin M. Ward
Patented Case
View Patent ↗
Granted: Sep 23, 2003
Filed: Aug 30, 2001
Inventors
Bart Andrew Nuss
Gregory A. Phillips
Richard L. Hall
Kevin M. Ward
Assignee (at issue)
Credo Tool 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.