Granted Patent
Utility
US 4,885,119 · App. 07/261,297
Method of making a multilayer film
Inventors:
Walter B. Mueller, Henry G. Schirmer
Patented Case
View Patent ↗
Granted: Dec 5, 1989
Filed: Oct 21, 1988
Inventors
Walter B. Mueller
Henry G. Schirmer
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.