Granted Patent
Utility
US 4,375,407 · App. 06/275,905
High gradient magnetic separation device
Inventor:
Paul L. Kronick
Patented Case
View Patent ↗
Granted: Mar 1, 1983
Filed: Jun 22, 1981
Inventor
Paul L. Kronick
Assignee (at issue)
The Franklin Institute
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.