Granted Patent
Utility
US 5,748,658 · App. 08/789,199
Semiconductor laser device and optical pickup head
Inventors:
Hideyuki Nakanishi, Akira Ueno, Hideo Nagai, Akio Yoshikawa
Patented Case
View Patent ↗
Granted: May 5, 1998
Filed: Jan 24, 1997
Inventors
Hideyuki Nakanishi
Akira Ueno
Hideo Nagai
Akio Yoshikawa
Assignee (at issue)
SUMITOMO ELECTRIC INDUSTRIES, LTD.
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.