Granted Patent
Utility
US 5,338,807 · App. 07/814,734
Synthesis of creping aids based on polyamides containing methyl bis(3-aminopropylamine)
Inventors:
Herbert H. Espy, William W. Maslanka
Patented Case
View Patent ↗
Granted: Aug 16, 1994
Filed: Dec 23, 1991
Inventors
Herbert H. Espy
William W. Maslanka
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.