Granted Patent
Utility
US 4,688,199 · App. 06/751,952
Transducers and control means
Inventor:
Michael W. B. Lock
Patented Case
View Patent ↗
Granted: Aug 18, 1987
Filed: Jul 5, 1985
Inventor
Michael W. B. Lock
Assignee (at issue)
Internationale Otrool Maatschappij Octropa B.V.
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.