Granted Patent
Utility
US 4,176,056 · App. 05/900,454
Cyclic operation of a bed of mixed ion exchange resins
Inventor:
Jesse G. Grier
Patented Case
View Patent ↗
Granted: Nov 27, 1979
Filed: Apr 27, 1978
Inventor
Jesse G. Grier
Assignee (at issue)
Pennwalt 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.