Granted Patent
Utility
US 6,642,415 · App. 10/110,643
Method for recovering fluorinated emulsifiers
Inventors:
Stephan Führer, Klaus Hintzer, Gernot Lohr, Werner Schwertfeger
Patented Case
View Patent ↗
Granted: Nov 4, 2003
Filed: Apr 12, 2002
Inventors
Stephan Führer
Klaus Hintzer
Gernot Lohr
Werner Schwertfeger
Assignee (at issue)
3M INNOVATIVE PROPERTIES COMPANY
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.