Granted Patent
Utility
US 4,369,584 · App. 06/254,989
Preventing air film between web and roller
Inventor:
Robert A. Daane
Patented Case
View Patent ↗
Granted: Jan 25, 1983
Filed: Apr 16, 1981
Inventor
Robert A. Daane
Assignee (at issue)
W. R. Grace & Co.
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.