Granted Patent
Utility
US 4,971,801 · App. 07/057,344
Biologic response modifier
Inventor:
Richard Urban
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Jun 2, 1987
Inventor
Richard Urban
Assignee (at issue)
Cell Technology, 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.