Granted Patent
Utility
US 5,344,992 · App. 08/060,461
Process for the preparation of linear 1,3-diketones
Inventors:
Rolf Drewes, Hans-Helmut Friedrich, Hans Mehner, Bernd Braun, Walter Wecht
Patented Case
View Patent ↗
Granted: Sep 6, 1994
Filed: May 11, 1993
Inventors
Rolf Drewes
Hans-Helmut Friedrich
Hans Mehner
Bernd Braun
Walter Wecht
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.