Granted Patent
Utility
US 4,742,870 · App. 06/924,605
Heat exchanger
Inventors:
Thomas G. Darone, Robert W. Langley
Patented Case
View Patent ↗
Granted: May 10, 1988
Filed: Oct 29, 1986
Inventors
Thomas G. Darone
Robert W. Langley
Assignee (at issue)
Cobe Laboratories, 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.