Granted Patent
Utility
US 4,512,731 · App. 06/531,371
Apparatus and process for filtering molten polymer
Inventor:
Arnold J. Cobb
Patented Case
View Patent ↗
Granted: Apr 23, 1985
Filed: Sep 12, 1983
Inventor
Arnold J. Cobb
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.