Granted Patent
Utility
US 4,824,901 · App. 07/185,853
Surface treated absorbent polymers
Inventors:
William Alexander, Mark Anderson, Barbara R. Regan
Patented Case
View Patent ↗
Granted: Apr 25, 1989
Filed: Apr 25, 1988
Inventors
William Alexander
Mark Anderson
Barbara R. Regan
Assignee (at issue)
American Colloid Company
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.