Granted Patent
Utility
US 6,521,342 · App. 10/171,329
Cationic core-shell particles with acid-swellable shells
Inventors:
G. Frederick Hutter, Camille Stebbins
Patented Case
View Patent ↗
Granted: Feb 18, 2003
Filed: Jun 12, 2002
Inventors
G. Frederick Hutter
Camille Stebbins
Assignee (at issue)
Westvaco Corporation
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.