Granted Patent
Utility
US 5,260,421 · App. 07/136,236
Site-directed mutagenesis modified glycoprotein hormones
Inventors:
Scott C. Chappel, Edward G. Bernstine
Patented Case
View Patent ↗
Granted: Nov 9, 1993
Filed: Dec 21, 1987
Inventors
Scott C. Chappel
Edward G. Bernstine
Assignee (at issue)
APPLIED RESEARCH SYSTEMS ARS HOLDING N.V.
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.