Granted Patent
Utility
US 4,973,637 · App. 07/483,374
Polymers made from quaternary ammonium acrylic monomers
Inventors:
Michael E. Morgan, Martha A. Phelps
Patented Case
View Patent ↗
Granted: Nov 27, 1990
Filed: Feb 22, 1990
Inventors
Michael E. Morgan
Martha A. Phelps
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.