Granted Patent
Utility
US 5,680,768 · App. 08/590,668
Concentric pulse tube expander with vacuum insulator
Inventors:
Alan A. Rattray, Steven C. Soloski, Frithjof N. Mastrup
Patented Case
View Patent ↗
Granted: Oct 28, 1997
Filed: Jan 24, 1996
Inventors
Alan A. Rattray
Steven C. Soloski
Frithjof N. Mastrup
Assignee (at issue)
HUGHES ELECTRONICS LIMITED
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.