Granted Patent
Utility
US 5,079,277 · App. 07/343,638
Poly-vinylphosphonic acid and metal oxide or cermet or glass ionomer cement
Inventors:
Alan D. Wilson, John Ellis
Patented Case
View Patent ↗
Granted: Jan 7, 1992
Filed: Apr 27, 1989
Inventors
Alan D. Wilson
John Ellis
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.