Granted Patent
Utility
US 5,248,449 · App. 07/913,504
Emulsion breaking using cationic quaternary ammonium starch/gums
Inventors:
David B. Mitchell, Mark W. Salihar
Patented Case
View Patent ↗
Granted: Sep 28, 1993
Filed: Jul 14, 1992
Inventors
David B. Mitchell
Mark W. Salihar
Assignee (at issue)
W.R. Grace & Co. Conn.
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.