Granted Patent
Utility
US 6,509,461 · App. 09/788,116
Process for producing particulate, water-soluble cellulose derivatives
Inventors:
Hartwig Schlesiger, Martin Morning, Gunter Weber, Rene Kiesewetter, Rudolf Lelgemann
Patented Case
View Patent ↗
Granted: Jan 21, 2003
Filed: Feb 16, 2001
Inventors
Hartwig Schlesiger
Martin Morning
Gunter Weber
Rene Kiesewetter
Rudolf Lelgemann
Assignee (at issue)
Wolff Walsrode AG
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.