Granted Patent
Utility
US 4,584,188 · App. 06/677,473
Hydrogels
Inventor:
Neil B. Graham
Patented Case
View Patent ↗
Granted: Apr 22, 1986
Filed: Dec 3, 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.