Granted Patent
Utility
US 4,291,009 · App. 06/161,507
Catalytic process for the production of alkali metal stannates
Inventor:
John A. Franks, Jr.
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Jun 19, 1980
Inventor
John A. Franks, Jr.
Assignee (at issue)
Vulcan Materials Company
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.