Granted Patent
Utility
US 4,993,448 · App. 07/314,616
Crude oil emulsions containing a compatible fluorochemical surfactant
Inventors:
Athanasios Karydas, Juliana Rodgers
Patented Case
View Patent ↗
Granted: Feb 19, 1991
Filed: Feb 23, 1989
Inventors
Athanasios Karydas
Juliana Rodgers
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.