Granted Patent
Utility
US 6,143,821 · App. 09/068,560
Water-absorbing polymers with improved properties, process for the preparation and use thereof
Inventor:
Jochen Houben
Patented Case
View Patent ↗
Granted: Nov 7, 2000
Filed: May 20, 1998
Inventor
Jochen Houben
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.