Granted Patent
Utility
US 4,430,272 · App. 06/347,178
Fluorine-containing alkylsulfobetaines, a process for their preparation and their use
Inventors:
Winfried Ehrl, Siegfried Jung
Patented Case
View Patent ↗
Granted: Feb 7, 1984
Filed: Feb 9, 1982
Inventors
Winfried Ehrl
Siegfried Jung
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.