Process for the production of water-absorbing polymer material with incorporated water-soluble substances and its use for the absorption and/or subsequent release of water or aqueous solutions

Granted: Nov 23, 1993 Filed: Sep 17, 1991

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.