Granted Patent
Utility
US 4,147,690 · App. 05/860,220
Smoke and fire resistant compositions
Inventor:
Russell P. Rich
Patented Case
View Patent ↗
Granted: Apr 3, 1979
Filed: Dec 13, 1977
Inventor
Russell P. Rich
Assignee (at issue)
The Burns & Russell Company of Baltimore
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.