Granted Patent
Utility
US 4,145,177 · App. 05/859,824
Air cooling ring for plastic film with independent lubricating air for film guide surface
Inventor:
Charles M. Schott, Jr.
Patented Case
View Patent ↗
Granted: Mar 20, 1979
Filed: Dec 12, 1977
Inventor
Charles M. Schott, Jr.
Assignee (at issue)
Gloucester Engineering Co., 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.