Granted Patent
Utility
US 5,119,875 · App. 07/638,323
Hydraulically actuated lock system
Inventor:
Ray A. Richard
Patented Case
View Patent ↗
Granted: Jun 9, 1992
Filed: Jan 7, 1991
Inventor
Ray A. Richard
Assignee (at issue)
Otis Engineering 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.