Granted Patent
Utility
US 5,901,783 · App. 08/895,681
Cryogenic heat exchanger
Inventors:
John D. Dobak, III, Ray Radebaugh, Eric D. Marquardt
Patented Case
View Patent ↗
Granted: May 11, 1999
Filed: Jul 17, 1997
Inventors
John D. Dobak, III
Ray Radebaugh
Eric D. Marquardt
Assignees (at issue)
Croyogen, Inc.
GOVERNMENT OF THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF COMMERCE
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.