Granted Patent
Utility
US 4,840,225 · App. 07/037,046
Heat exchange element and enclosure incorporating same
Inventors:
John M. Foley, Ronald L. Piuze, Ralph I. Larson, George A. Doumani
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Apr 10, 1987
Inventors
John M. Foley
Ronald L. Piuze
Ralph I. Larson
George A. Doumani
Assignee (at issue)
Digital Equipment Corporation
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.