Granted Patent
Utility
US 5,166,055 · App. 07/729,892
Microbiological preparation of 9-alpha-hydroxy-17-keto steroids
Inventors:
Harmen Slijkhuis, Arthur F. Marx
Patented Case
View Patent ↗
Granted: Nov 24, 1992
Filed: Jul 15, 1991
Inventors
Harmen Slijkhuis
Arthur F. Marx
Assignee (at issue)
Gist-Brocades N.V.
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.