Granted Patent
Utility
US 4,820,742 · App. 06/946,614
Method for continuous manufacture of solid water absorbing resin
Inventors:
William Alexander, Maynard Teppo
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Dec 29, 1986
Inventors
William Alexander
Maynard Teppo
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.