Semiconductor laser device
CA 1284371 C · Owner: Nec Corporation · Inventors: Yamaguchi, Masayuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A semiconductor laser device which oscillates with a single longitudinal mode and has a continuous wavelength tuning capability is described. It has a multi-layered semiconductor structure including a first control region and a second control region arranged in a row along an axis of resonance. The active region includes an active layer for emitting light responsive to stimulation the first control, region includes a guide layer for guiding light which is being propagated and the second control region includes a guide layer provided with a diffraction grating for guiding light which is being propagated. An active electrode is provided for injecting a current into the active region. A first …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 21, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 21, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.