Granted Patent
Utility
US 4,407,984 · App. 06/321,225
Dental compositions
Inventors:
Maurice J. Ratcliffe, Thomas A. Roberts
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Nov 13, 1981
Inventors
Maurice J. Ratcliffe
Thomas A. Roberts
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.