Granted Patent
Utility
US 5,253,693 · App. 07/953,482
Hold and release mechanism for a fire door spring tension adjusting wheel
Inventors:
Wayne G. Marlatt, Wojciech K. Cader
Patented Case
View Patent ↗
Granted: Oct 19, 1993
Filed: Sep 29, 1992
Inventors
Wayne G. Marlatt
Wojciech K. Cader
Assignee (at issue)
Atlas Roll-Lite Door Corp.
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.