Granted Patent
Utility
US 4,242,516 · App. 05/868,772
Fluorinated amphoteric surfactants
Inventor:
Karl F. Mueller
Patented Case
View Patent ↗
Granted: Dec 30, 1980
Filed: Jan 12, 1978
Inventor
Karl F. Mueller
Assignee (at issue)
Ciba-Geigy
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.