Granted Patent
Utility
US 4,515,821 · App. 06/530,363
Calcined silicas and their use in beer clarification
Inventors:
Brian H. Armstead, James P. Quinn
Patented Case
View Patent ↗
Granted: May 7, 1985
Filed: Sep 8, 1983
Inventors
Brian H. Armstead
James P. Quinn
Assignee (at issue)
Internationale Otrool Maatschappij Octropa B.V.
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.