Granted Patent
Utility
US 4,419,498 · App. 06/407,533
Process for producing quaternary ammonium amino polyamide containing halohydrin functionality
Inventor:
Ralph A. Bankert
Patented Case
View Patent ↗
Granted: Dec 6, 1983
Filed: Aug 12, 1982
Inventor
Ralph A. Bankert
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.