Granted Patent
Utility
US 4,448,136 · App. 06/395,267
Boiler with waste heat recovery
Inventor:
Martin White
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Jul 6, 1982
Inventor
Martin White
Assignee (at issue)
British Gas
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.