Granted Patent
Utility
US 5,687,507 · App. 08/537,035
Apparatus for selective alteration of operating parameters of a door
Inventor:
Mark A. Beran
Patented Case
View Patent ↗
Granted: Nov 18, 1997
Filed: Sep 29, 1995
Inventor
Mark A. Beran
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.