Granted Patent
Utility
US 4,048,284 · App. 05/665,095
Method and system for ion-exchanging particles
Inventors:
Norman H. Horton, John L. Smith
Patented Case
View Patent ↗
Granted: Sep 13, 1977
Filed: Mar 8, 1976
Inventors
Norman H. Horton
John L. Smith
Assignee (at issue)
Engelhard Minerals & Chemicals 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.