Granted Patent
Utility
US 5,223,491 · App. 07/435,032
Method for revitalizing skin by applying topically water insoluble glucan
Inventor:
Byron A. Donzis
Patented Case
View Patent ↗
Granted: Jun 29, 1993
Filed: Nov 9, 1989
Inventor
Byron A. Donzis
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.