Granted Patent
Utility
US 5,844,041 · App. 08/910,127
Process for increasing the viscosity of aqueous solutions of homogeneous copolymers of vinyl pyrrolidone and n-3, 3-dimethylaminopropyl methacrylamide
Inventors:
Lowell R. Anderson, Kou-Chang Liu, Hemant Parikh
Patented Case
View Patent ↗
Granted: Dec 1, 1998
Filed: Aug 13, 1997
Inventors
Lowell R. Anderson
Kou-Chang Liu
Hemant Parikh
Assignee (at issue)
ISP INVESTMENTS LLC
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.