Granted Patent
Utility
US 4,298,697 · App. 06/087,331
Method of making sheet or shaped cation exchange membrane
Inventors:
Stanley K. Baczek, G. Howard McCain
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: Oct 23, 1979
Inventors
Stanley K. Baczek
G. Howard McCain
Assignee (at issue)
Diamond Shamrock Corporation
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.