Granted Patent
Utility
US 5,923,751 · App. 08/551,321
Opening and closing device for a portable telephone
Inventors:
Yoshihiro Ohtsuka, Michio Nagai
Patented Case
View Patent ↗
Granted: Jul 13, 1999
Filed: Nov 1, 1995
Inventors
Yoshihiro Ohtsuka
Michio Nagai
Assignees (at issue)
Katoh Electrical Machinery Co., Ltd.
NEC 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.