Granted Patent
Utility
US 4,035,459 · App. 05/573,732
Process for spinning dry-fiber cellulose acetate hollow fiber membranes
Inventor:
Robert E. Kesting
Patented Case
View Patent ↗
Granted: Jul 12, 1977
Filed: May 1, 1975
Inventor
Robert E. Kesting
Assignee (at issue)
Chemico Systems, Inc.
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.