Granted Patent
Utility
US 4,638,765 · App. 06/791,175
Heat recovery system
Inventor:
Geoffrey Frederick Skinner
Patented Case
View Patent ↗
Granted: Jan 27, 1987
Filed: Oct 24, 1985
Inventor
Geoffrey Frederick Skinner
Assignee (at issue)
Foster Wheeler Energy Limited
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.