Granted Patent
Utility
US 4,286,365 · App. 05/709,831
Heat exchangers
Inventor:
Gordon Robert Creighton
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Jul 29, 1976
Inventor
Gordon Robert Creighton
Assignee (at issue)
Ciba-Geigy
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.