Granted Patent
Utility
US 6,002,217 · App. 08/914,450
Door operating system
Inventors:
James C. Stevens, Robert Utterback, James Rhoads
Patented Case
View Patent ↗
Granted: Dec 14, 1999
Filed: Aug 19, 1997
Inventors
James C. Stevens
Robert Utterback
James Rhoads
Assignee (at issue)
Dorma Door Controls, Inc.
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.