Granted Patent
Utility
US 4,575,844 · App. 06/615,438
Digital switching system
Inventors:
Yasuharu Kosuge, Noriharu Miyaho
Patented Case
View Patent ↗
Granted: Mar 11, 1986
Filed: May 30, 1984
Inventors
Yasuharu Kosuge
Noriharu Miyaho
Assignee (at issue)
NIPPON TELEGRAPH AND TELEPHONE 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.