Granted Patent
Utility
US 6,082,993 · App. 09/322,394
Induced draft heater with premixing burners
Inventors:
Timothy P. O'Leary, David L. Schardt, Vance Elliot Willis
Patented Case
View Patent ↗
Granted: Jul 4, 2000
Filed: May 28, 1999
Inventors
Timothy P. O'Leary
David L. Schardt
Vance Elliot Willis
Assignee (at issue)
H-TECH AG
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.