Granted Patent
Utility
US 4,528,365 · App. 06/569,263
Hydrogels
Inventor:
Neil B. Graham
Patented Case
View Patent ↗
Granted: Jul 9, 1985
Filed: Jan 9, 1984
Inventor
Neil B. Graham
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.