Granted Patent
Utility
US 6,178,926 · App. 09/387,269
Double-fired horizontal tube heater
Inventor:
Donald D. Worman
Patented Case
View Patent ↗
Granted: Jan 30, 2001
Filed: Aug 31, 1999
Inventor
Donald D. Worman
Assignee (at issue)
Foster Wheeler Corporation
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.