Granted Patent
Utility
US 5,639,840 · App. 08/378,657
Fluoride ion releasing dental materials
Inventors:
Wilmer K. Fife, Martel Zeldin, Slawomir Rubinsztajn
Patented Case
View Patent ↗
Granted: Jun 17, 1997
Filed: Jan 26, 1995
Inventors
Wilmer K. Fife
Martel Zeldin
Slawomir Rubinsztajn
Assignee (at issue)
THE TRUSTEES OF INDIANA UNIVERSITY
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.