Granted Patent
Utility
US 4,576,254 · App. 06/577,015
Hydraulically actuated slip assembly
Inventor:
Don C. Cox
Patented Case
View Patent ↗
Granted: Mar 18, 1986
Filed: Feb 6, 1984
Inventor
Don C. Cox
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.