Granted Patent
Utility
US 5,704,250 · App. 08/626,273
Ball screw drive with dynamically adjustable preload
Inventor:
James E. Black, Jr.
Patented Case
View Patent ↗
Granted: Jan 6, 1998
Filed: Apr 4, 1996
Inventor
James E. Black, Jr.
Assignee (at issue)
Western Atlas, 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.