Granted Patent
Utility
US 5,199,187 · App. 07/738,785
Freeze dryer apparatus having an interim condensing system and use thereof
Inventor:
David T. Sutherland
Patented Case
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Granted: Apr 6, 1993
Filed: Jul 31, 1991
Inventor
David T. Sutherland
Assignee (at issue)
SP Industries LLC
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.