Granted Patent
Utility
US 4,964,376 · App. 07/420,601
Device for bypassing heat exchange conduits
Inventors:
Jack R. Veach, Alden C. Helleksen
Patented Case
View Patent ↗
Granted: Oct 23, 1990
Filed: Oct 3, 1989
Inventors
Jack R. Veach
Alden C. Helleksen
Assignee (at issue)
Arctic Fox Heaters, Inc.
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.