Granted Patent
Utility
US 4,303,641 · App. 05/909,149
Hydrous silica gel containing dentifrice
Inventors:
Robert B. DeWolf, II, Rimantas Glemza
Patented Case
View Patent ↗
Granted: Dec 1, 1981
Filed: May 24, 1978
Inventors
Robert B. DeWolf, II
Rimantas Glemza
Assignee (at issue)
W. R. Grace & Co.
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.