Granted Patent
Utility
US 4,996,375 · App. 07/341,889
Vitamin E intermediates and a process for their manufacture and conversion into Vitamin E
Inventors:
Richard Barner, Josef Hubscher
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Apr 24, 1989
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.