Granted Patent
Utility
US 4,889,637 · App. 07/235,269
Scale control with terpolymers containing vinyl alcohol
Inventors:
Zahid Amjad, William F. Masler, III
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Aug 23, 1988
Inventors
Zahid Amjad
William F. Masler, III
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.