Granted Patent
Utility
US 4,397,156 · App. 06/313,697
Displacer for low-temperature refrigerating machines
Inventors:
Rolf Heisig, Hans-Hermann Klein, Karl-Heinz Volker
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: Oct 21, 1981
Inventors
Rolf Heisig
Hans-Hermann Klein
Karl-Heinz Volker
Assignee (at issue)
Leybold-Heraeus GmbH
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.