Granted Patent
Utility
US 5,012,687 · App. 07/432,939
Ball screw
Inventor:
Kaoru Hoshide
Patented Case
View Patent ↗
Granted: May 7, 1991
Filed: Nov 7, 1989
Inventor
Kaoru Hoshide
Assignee (at issue)
THK CO., LTD.
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.