Granted Patent
Utility
US 4,744,932 · App. 06/739,946
Process for forming a skinless hollow fiber of a cellulose ester
Inventor:
Colin L. Browne
Patented Case
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Granted: May 17, 1988
Filed: May 31, 1985
Inventor
Colin L. Browne
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.