Granted Patent
Utility
US 4,493,367 · App. 06/544,927
Repair of double shell heat exchangers
Inventor:
Eugene M. Haynes
Patented Case
View Patent ↗
Granted: Jan 15, 1985
Filed: Oct 24, 1983
Inventor
Eugene M. Haynes
Assignee (at issue)
Owens-Corning Fiberglas Corp.
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.