Granted Patent
Utility
US 4,307,148 · App. 06/068,260
Flame retardant with improved durability comprising an alkali metal polyantimonate and cellulosic materials treated therewith in the absence of chlorine
Inventor:
Destin A. LeBlanc
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: Aug 20, 1979
Inventor
Destin A. LeBlanc
Assignee (at issue)
The Harshaw Chemical 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.