Granted Patent
Utility
US 5,874,632 · App. 08/856,859
Method of producing ketoisophorone
Inventors:
Rainer Hahn, Ulrich Gora, Klaus Huthmacher, Frank Hubner, Steffen Krill
Patented Case
View Patent ↗
Granted: Feb 23, 1999
Filed: May 15, 1997
Inventors
Rainer Hahn
Ulrich Gora
Klaus Huthmacher
Frank Hubner
Steffen Krill
Assignee (at issue)
Degussa AG
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.