Granted Patent
Utility
US 6,814,880 · App. 09/257,066
Water based liquid foam extinguishing formulation
Inventors:
Robert Graf, Stefan Keipl
Patented Case
View Patent ↗
Granted: Nov 9, 2004
Filed: Feb 25, 1999
Inventors
Robert Graf
Stefan Keipl
Assignee (at issue)
Cognis Deutschland GmbH & Co. KG
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.