Granted Patent
Utility
US 4,874,827 · App. 07/235,505
Production of highly-dispersible water-soluble polymers
Inventors:
Ratana Kanluen, Brigitte H. Licht
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Aug 24, 1988
Inventors
Ratana Kanluen
Brigitte H. Licht
Assignee (at issue)
Hart Chemical Limited
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.