Granted Patent
Utility
US 4,857,552 · App. 07/203,836
Stable pharmaceutical composition
Inventors:
Leonard Rosenberg, Cheryl Black, Earl R. Speicher, Dietmar Wagenknecht
Patented Case
View Patent ↗
Granted: Aug 15, 1989
Filed: Jun 8, 1988
Inventors
Leonard Rosenberg
Cheryl Black
Earl R. Speicher
Dietmar Wagenknecht
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.