Granted Patent
Utility
US 4,458,033 · App. 06/488,506
Regeneration of cationic resin in nonaqueous media
Inventors:
Tsoung Y. Yan, Paul Shu
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Apr 25, 1983
Inventors
Tsoung Y. Yan
Paul Shu
Assignee (at issue)
Mobil Oil 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.