Granted Patent
Utility
US 5,079,236 · App. 07/054,859
Pure, sterile, pyrogen-free hyaluronic acid formulations their methods of preparation and methods of use
Inventors:
Alan Drizen, Anita Aviad
Patented Case
View Patent ↗
Granted: Jan 7, 1992
Filed: May 27, 1987
Inventors
Alan Drizen
Anita Aviad
Assignee (at issue)
Hyal Pharmaceutical Corporation
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.