Granted Patent
Utility
US 4,472,540 · App. 06/398,225
Wide joint latex grout composition
Inventor:
John Barker
Patented Case
View Patent ↗
Granted: Sep 18, 1984
Filed: Jul 14, 1982
Inventor
John Barker
Assignee (at issue)
American Olean Tile 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.