Distributed feedback semiconductor laser
CA 1303195 C · Owner: Sony Corporation · Inventors: Hirata, Shoji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A distributed feedback semiconductor laser has a first cladding layer, an active layer, a guide layer on which a diffraction grating is formed and a second cladding layer the effective thickness of the guide layer in the waveguide direction being made different in one region to change the phase of a light propagating through the waveguide.
Read the whole patent
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 June 9, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 9, 2009.
- 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.