Granted Patent
Utility
US 5,564,761 · App. 08/615,072
Door lock device with automatic closing mechanism
Inventors:
Tetsuro Mizuki, Jiro Mitsui
Patented Case
View Patent ↗
Granted: Oct 15, 1996
Filed: Mar 14, 1996
Inventors
Tetsuro Mizuki
Jiro Mitsui
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.