Granted Patent
Utility
US 4,689,160 · App. 06/819,447
Acid stable heteropolysaccharide s-421
Inventors:
Suzanne M. Steenbergen, Glen H. Best
Patented Case
View Patent ↗
Granted: Aug 25, 1987
Filed: Jan 16, 1986
Inventors
Suzanne M. Steenbergen
Glen H. Best
Assignee (at issue)
MERCK & CO., 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.