Granted Patent
Utility
US 6,670,643 · App. 10/320,497
Semiconductor laser device and its manufacturing method, and optical disc reproducing and recording apparatus
Inventor:
Shuichi Hirukawa
Patented Case
View Patent ↗
Granted: Dec 30, 2003
Filed: Dec 17, 2002
Inventor
Shuichi Hirukawa
Assignee (at issue)
SHARP 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.