Granted Patent
Utility
US 5,744,644 · App. 08/652,148
Concentrated solutions of polyhydroxyalkylamines and their use
Inventor:
Bernd Papenfuhs
Patented Case
View Patent ↗
Granted: Apr 28, 1998
Filed: May 23, 1996
Inventor
Bernd Papenfuhs
Assignee (at issue)
Hoechst GmbH
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.