Granted Patent
Utility
US 4,430,788 · App. 06/237,201
Repair of double shell heat exchangers
Inventor:
Eugene M. Haynes
Patented Case
View Patent ↗
Granted: Feb 14, 1984
Filed: Feb 23, 1981
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.