Granted Patent
Utility
US 4,871,886 · App. 07/061,372
Electronic key and receptacle therefor
Inventors:
John E. Vaughan, David R. Smale, Bernard Patry, John C. Heaton
Patented Case
View Patent ↗
Granted: Oct 3, 1989
Filed: Jun 15, 1987
Inventors
John E. Vaughan
David R. Smale
Bernard Patry
John C. Heaton
Assignee (at issue)
Schlumberger Industires, S.A.
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.