Granted Patent
Utility
US 5,358,915 · App. 08/017,382
Process for regenerating spent acid-activated bentonite clays and smectite catalysts
Inventors:
Robert S. Nebergall, Dennis R. Taylor, Carolyn J. Kucharz
Patented Case
View Patent ↗
Granted: Oct 25, 1994
Filed: Feb 12, 1993
Inventors
Robert S. Nebergall
Dennis R. Taylor
Carolyn J. Kucharz
Assignee (at issue)
American Colloid 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.