Granted Patent
Utility
US 5,206,971 · App. 07/806,200
Apparatus and method for increasing the efficiency of a door closer by reducing friction therein
Inventors:
Lynn A. Schmelzer, Thomas R. Lasier
Patented Case
View Patent ↗
Granted: May 4, 1993
Filed: Dec 13, 1991
Inventors
Lynn A. Schmelzer
Thomas R. Lasier
Assignee (at issue)
Schlage Lock Company LLC
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.