Granted Patent
Utility
US 5,636,747 · App. 08/305,525
Combination magnetic separation, classification and attrition process for renewing and recovering particulates
Inventors:
William P. Hettinger, Jr., Howard F. Moore, Terry L. Goolsby, A. V. Peppard
Patented Case
View Patent ↗
Granted: Jun 10, 1997
Filed: Sep 13, 1994
Inventors
William P. Hettinger, Jr.
Howard F. Moore
Terry L. Goolsby
A. V. Peppard
Assignee (at issue)
Ashland, Inc.
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.