Granted Patent
Utility
US 4,286,392 · App. 06/117,501
Automatic load-adjusting vent control for film dryers
Inventor:
Michael G. Viland
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Feb 1, 1980
Inventor
Michael G. Viland
Assignee (at issue)
Pako 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.