Granted Patent
Utility
US 4,051,079 · App. 05/698,764
Regeneration of acidic cation exchange resin using acidified phenol-water mixture
Inventor:
Earl G. Melby
Patented Case
View Patent ↗
Granted: Sep 27, 1977
Filed: Jun 22, 1976
Inventor
Earl G. Melby
Assignee (at issue)
Union Carbide 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.