Granted Patent
Utility
US 5,647,228 · App. 08/679,553
Apparatus and method for regulating temperature in a cryogenic test chamber
Inventors:
Ronald E. Sager, Stefano Spagna
Patented Case
View Patent ↗
Granted: Jul 15, 1997
Filed: Jul 12, 1996
Inventors
Ronald E. Sager
Stefano Spagna
Assignee (at issue)
Quantum Design, 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.