Granted Patent
Utility
US 4,946,450 · App. 07/341,012
Glucan/collagen therapeutic eye shields
Inventor:
Robert L. Erwin
Patented Case
View Patent ↗
Granted: Aug 7, 1990
Filed: Apr 18, 1989
Inventor
Robert L. Erwin
Assignee (at issue)
Biosource Genetics 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.