Granted Patent
Utility
US 5,127,821 · App. 07/511,233
Premixing burner for producing hot gas
Inventor:
Jakob Keller
Patented Case
View Patent ↗
Granted: Jul 7, 1992
Filed: Apr 19, 1990
Inventor
Jakob Keller
Assignee (at issue)
Asea Brown Boveri, S.A.
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.