Granted Patent
Utility
US 6,160,180 · App. 09/230,538
Tertiary phosphanes containing alkylene glycol groups
Inventors:
Steffen Haber, Hans-Jerg Kleiner, Sandra Bogdanovic, Helmut Bahrmann, Carl D. Frohning
Patented Case
View Patent ↗
Granted: Dec 12, 2000
Filed: Apr 22, 1999
Inventors
Steffen Haber
Hans-Jerg Kleiner
Sandra Bogdanovic
Helmut Bahrmann
Carl D. Frohning
Assignee (at issue)
CELANESE CHEMICALS EUROPE 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.