Granted Patent
Utility
US 5,844,931 · App. 08/903,881
Semiconductor laser devices
Inventors:
Misuzu Sagawa, Kiyohisa Hiramoto, Tomonobu Tsuchiya, Takashi Toyonaka, Kazunori Shinoda
Patented Case
View Patent ↗
Granted: Dec 1, 1998
Filed: Jul 31, 1997
Inventors
Misuzu Sagawa
Kiyohisa Hiramoto
Tomonobu Tsuchiya
Takashi Toyonaka
Kazunori Shinoda
Assignee (at issue)
HITACHI, 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.