Granted Patent
Utility
US 4,339,843 · App. 06/153,741
Door closer with assist or door operating features
Inventor:
L. Nelson Burnett, Jr.
Patented Case
View Patent ↗
Granted: Jul 20, 1982
Filed: May 27, 1980
Inventor
L. Nelson Burnett, Jr.
Assignee (at issue)
Reading-Dorma Closer 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.