Granted Patent
Utility
US 5,885,413 · App. 08/749,873
Deinking wastepaper containing electrostatic printed ink using branched alcohol alkoxylate surfactant
Inventors:
Sandra K. Richmann, Frank J. Sutman
Patented Case
View Patent ↗
Granted: Mar 23, 1999
Filed: Nov 15, 1996
Inventors
Sandra K. Richmann
Frank J. Sutman
Assignee (at issue)
Betzdearborn, Inc.
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.