Granted Patent
Utility
US 4,226,786 · App. 06/081,957
Process for dehydrogenation of sterols to produce .DELTA..sup.4 -3-ketosteroids (II)
Inventors:
Charles H. Foster, Donald R. Nelan
Patented Case
View Patent ↗
Granted: Oct 7, 1980
Filed: Oct 4, 1979
Inventors
Charles H. Foster
Donald R. Nelan
Assignee (at issue)
EASTMAN KODAK 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.