Granted Patent
Utility
US 5,820,863 · App. 08/396,452
Methods of preparation and use for zona pellucida antigens and antibodies for sterilization and contraception
Inventor:
Bonita S. Dunbar
Patented Case
View Patent ↗
Granted: Oct 13, 1998
Filed: Feb 28, 1995
Inventor
Bonita S. Dunbar
Assignee (at issue)
Zonagen, 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.