Granted Patent
Utility
US 5,427,421 · App. 08/111,510
Door lock device with one-motion door opening mechanism
Inventor:
Osamu Hamaguchi
Patented Case
View Patent ↗
Granted: Jun 27, 1995
Filed: Aug 24, 1993
Inventor
Osamu Hamaguchi
Assignee (at issue)
Mitsui Kinzoku Kogyo Kabushiki Kaisha
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.