Granted Patent
Utility
US 4,958,035 · App. 07/373,000
Process for synthesizing chromanes
Inventors:
Richard Barner, Josef Hubscher
Patented Case
View Patent ↗
Granted: Sep 18, 1990
Filed: Jun 29, 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.