Granted Patent
Utility
US 3,945,926 · App. 05/293,943
Integral microporous high void volume polycarbonate membranes and a dry process for forming same
Inventor:
Robert E. Kesting
Patented Case
View Patent ↗
Granted: Mar 23, 1976
Filed: Oct 2, 1972
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.