Granted Patent
Utility
US 6,620,889 · App. 09/914,466
Powdery, crosslinked absorbent polymers, method for the production thereof, and their use
Inventors:
Richard Mertens, Jorg Harren
Patented Case
View Patent ↗
Granted: Sep 16, 2003
Filed: Aug 29, 2001
Inventors
Richard Mertens
Jorg Harren
Assignee (at issue)
Stockhausen GmbH & Co. KG
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.