Granted Patent
Utility
US 4,752,339 · App. 06/547,145
Thixotropic aqueous solutions containing a divinylsulfone-crosslinked polygalactomannan gum
Inventor:
Rachel S. Kohn
Patented Case
View Patent ↗
Granted: Jun 21, 1988
Filed: Oct 31, 1983
Inventor
Rachel S. Kohn
Assignee (at issue)
Hi-Tek Polymers, 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.