Granted Patent
Utility
US 5,857,846 · App. 08/839,645
Burner
Inventors:
Thomas Sattelmayer, Martin Valk
Patented Case
View Patent ↗
Granted: Jan 12, 1999
Filed: Apr 15, 1997
Inventors
Thomas Sattelmayer
Martin Valk
Assignee (at issue)
ABB RESEARCH LTD.
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.