Granted Patent
Utility
US 4,535,002 · App. 06/599,768
Process for rendering a material fire retardant
Inventor:
William J. Kirkhuff
Patented Case
View Patent ↗
Granted: Aug 13, 1985
Filed: Apr 13, 1984
Inventor
William J. Kirkhuff
Assignee (at issue)
Kirkhuff, Shield & Fink
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.