Granted Patent
Utility
US 4,876,369 · App. 07/235,257
Process for synthesizing chromanes
Inventors:
Richard Barner, Josef Hubscher
Patented Case
View Patent ↗
Granted: Oct 24, 1989
Filed: Aug 23, 1988
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.