Granted Patent
Utility
US 4,672,033 · App. 06/737,120
Antibiotics X-14889 A,C and D
Inventors:
Chao-Min Liu, John Westley
Patented Case
View Patent ↗
Granted: Jun 9, 1987
Filed: May 23, 1985
Inventors
Chao-Min Liu
John Westley
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.