Granted Patent
Utility
US 4,429,539 · App. 06/433,316
Heat exchangers for vuilleumier cycle heat pumps
Inventor:
James Leach
Patented Case
View Patent ↗
Granted: Feb 7, 1984
Filed: Oct 7, 1982
Inventor
James Leach
Assignee (at issue)
Vought 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.