Granted Patent
Utility
US 6,559,300 · App. 09/462,730
Water-soluble biodegradable hydroxyalkyl cellulose-2-hydroxycarboxylic acid esters which can flocculate
Inventors:
Joachim Simon, Hanns P. Muller, Rainhard Koch, Volkhard Muller, Jurgen Engelhardt, Klaus Szablikowski, Wolfgang Koch
Patented Case
View Patent ↗
Granted: May 6, 2003
Filed: Jan 11, 2000
Inventors
Joachim Simon
Hanns P. Muller
Rainhard Koch
Volkhard Muller
Jurgen Engelhardt
Klaus Szablikowski
Wolfgang Koch
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.