Granted Patent
Utility
US 6,482,940 · App. 09/446,998
Cellulose ethers and method for producing the same
Inventors:
Erik-Andreas Klohr, Jörg Neubauer, Wolfgang Koch, Klaus Szablikowski, Detmar Redeker, Wolfgang Wagenknecht, Fritz Loth
Patented Case
View Patent ↗
Granted: Nov 19, 2002
Filed: Dec 30, 1999
Inventors
Erik-Andreas Klohr
Jörg Neubauer
Wolfgang Koch
Klaus Szablikowski
Detmar Redeker
Wolfgang Wagenknecht
Fritz Loth
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.