Granted Patent
Utility
US 5,029,459 · App. 07/472,953
Flat plastic key with rigid torque transfer insert
Inventor:
Robert Almblad
Patented Case
View Patent ↗
Granted: Jul 9, 1991
Filed: Jan 31, 1990
Inventor
Robert Almblad
Assignee (at issue)
MITSUBISHI 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.