Granted Patent
Utility
US 4,559,407 · App. 06/540,253
Intermediate in the production of vitamin E
Inventors:
Richard Barner, Josef Hubscher
Patented Case
View Patent ↗
Granted: Dec 17, 1985
Filed: Oct 11, 1983
Inventors
Richard Barner
Josef Hubscher
Assignee (at issue)
HOFFMANN-LA ROCHE INC.
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.