Granted Patent
Utility
US 4,891,253 · App. 07/273,386
Moisture barrier medical film
Inventor:
Walter B. Mueller
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: Nov 17, 1988
Inventor
Walter B. Mueller
Assignee (at issue)
W.R. Grace & Co. Conn.
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.