Granted Patent
Utility
US 4,280,003 · App. 06/048,794
Process for the preparation of high density anion exchange resins by bromination of crosslinked vinyltoluene copolymers
Inventors:
Jean E. E. Herbin, Paul D. A. Grammont
Patented Case
View Patent ↗
Granted: Jul 21, 1981
Filed: Jun 15, 1979
Inventors
Jean E. E. Herbin
Paul D. A. Grammont
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.