Granted Patent
Utility
US 4,871,327 · App. 07/271,897
Combined electrical grounding and mechanical locking means for ceiling mounted device
Inventors:
Paul Anthony Ridgway, William Butterfield
Patented Case
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Granted: Oct 3, 1989
Filed: Nov 14, 1988
Inventors
Paul Anthony Ridgway
William Butterfield
Assignee (at issue)
HP 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.