Granted Patent
Utility
US 4,961,995 · App. 07/389,741
Polishable, flame retarded, synthetic mineral product
Inventors:
Gilbert B. Ross, Lonnie F. Risley
Patented Case
View Patent ↗
Granted: Oct 9, 1990
Filed: Aug 4, 1989
Inventors
Gilbert B. Ross
Lonnie F. Risley
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.