Granted Patent
Utility
US 5,090,779 · App. 07/573,938
Acoustic signal transmission between a tractor and trailer within the air brake system
Inventor:
Dennis A. Kramer
Patented Case
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Granted: Feb 25, 1992
Filed: Aug 27, 1990
Inventor
Dennis A. Kramer
Assignee (at issue)
Rockwell International Corporation
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.