Granted Patent
Utility
US 5,110,674 · App. 07/720,055
Flame retardant bitumen
Inventors:
Louis L. Grube, Stanley P. Frankoski
Patented Case
View Patent ↗
Granted: May 5, 1992
Filed: Jun 24, 1991
Inventors
Louis L. Grube
Stanley P. Frankoski
Assignee (at issue)
GAF Building Materials Corporation
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.