Granted Patent
Utility
US 4,311,825 · App. 06/170,340
Acetal polymer
Inventor:
Harry Braus
Patented Case
View Patent ↗
Granted: Jan 19, 1982
Filed: Jul 21, 1980
Inventor
Harry Braus
Assignee (at issue)
National Distillers and Chemical Corporation
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.