Granted Patent
Utility
US 4,426,704 · App. 06/317,592
Semiconductor laser with two active layers
Inventors:
Haruo Nagai, Yoshio Noguchi, Kenichiro Takahei
Patented Case
View Patent ↗
Granted: Jan 17, 1984
Filed: Nov 2, 1981
Inventors
Haruo Nagai
Yoshio Noguchi
Kenichiro Takahei
Assignee (at issue)
Nippon Telegraph and Telephone Public 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.