Granted Patent
Utility
US 5,578,168 · App. 08/471,936
Aqueous suspensions of poly(ethylene oxide) useful as retention aids in paper manufacture
Inventors:
Charles L. Burdick, Elliott Echt
Patented Case
View Patent ↗
Granted: Nov 26, 1996
Filed: Jun 6, 1995
Inventors
Charles L. Burdick
Elliott Echt
Assignee (at issue)
HERCULES LLC
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.