Granted Patent
Utility
US 4,048,271 · App. 05/646,735
Dry process for forming polycarbonate membranes
Inventor:
Robert E. Kesting
Patented Case
View Patent ↗
Granted: Sep 13, 1977
Filed: Jan 5, 1976
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.