Granted Patent
Utility
US 6,620,374 · App. 09/681,757
Induction heat-treating of threaded fasteners with a rotary conveyor
Inventors:
Dean P. Stefanac, Thomas J. Bowers, Donald H. Wiseman, William Cartwright Weller
Patented Case
View Patent ↗
Granted: Sep 16, 2003
Filed: May 31, 2001
Inventors
Dean P. Stefanac
Thomas J. Bowers
Donald H. Wiseman
William Cartwright Weller
Assignee (at issue)
Pillar Industries
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.