Granted Patent
Utility
US 4,508,607 · App. 06/533,206
Particulate dialytic silica
Inventor:
Milton E. Winyall
Patented Case
View Patent ↗
Granted: Apr 2, 1985
Filed: Sep 20, 1983
Inventor
Milton E. Winyall
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.