Granted Patent
Utility
US 4,522,686 · App. 06/511,445
Aqueous sizing compositions
Inventor:
David H. Dumas
Patented Case
View Patent ↗
Granted: Jun 11, 1985
Filed: Jul 7, 1983
Inventor
David H. Dumas
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.