Granted Patent
Utility
US 4,533,859 · App. 06/358,346
Motorized ball nut
Inventor:
Richard Johnstone
Patented Case
View Patent ↗
Granted: Aug 6, 1985
Filed: Mar 15, 1982
Inventor
Richard Johnstone
Assignee (at issue)
Kearney & Trecker 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.