Granted Patent
Utility
US 4,817,878 · App. 06/530,022
Rotatable tool power lock retention apparatus for food processor
Inventor:
Koichiro Shibata
Patented Case
View Patent ↗
Granted: Apr 4, 1989
Filed: Sep 7, 1983
Inventor
Koichiro Shibata
Assignee (at issue)
Cuisinarts, 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.