Granted Patent
Utility
US 4,346,142 · App. 06/206,975
Hydrophilic monomer treated microporous films and process
Inventor:
Nelson R. Lazear
Patented Case
View Patent ↗
Granted: Aug 24, 1982
Filed: Nov 14, 1980
Inventor
Nelson R. Lazear
Assignee (at issue)
Celanese GmbH
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.