Granted Patent
Utility
US 5,153,603 · App. 07/698,890
Self-contained alcohol recorder purging and cleaning system for direct writing type trace recorders
Inventor:
Michael James Spence
Patented Case
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Granted: Oct 6, 1992
Filed: May 13, 1991
Inventor
Michael James Spence
Assignee (at issue)
General Dynamics Corporation Space Systems Division
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.