Granted Patent
Utility
US 4,469,805 · App. 06/436,602
Regeneration of filter clay with liquid methanol
Inventors:
William A. Kofke, Jr., Ilia Milson
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Oct 25, 1982
Inventors
William A. Kofke, Jr.
Ilia Milson
Assignee (at issue)
Gulf Research & Development Company
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.