Buried-type semiconductor laser device
CA 2085337 C · Owner: Kikuta, Toshio · Inventors: Kikuta, Toshio; Kasukawa, Akihiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides a buried-type semiconductor laser device that operates stably and reliably at a high temperature for a prolonged period of time. A buried-type semiconductor laser device according to the invention comprises a semiconductor substrate 2 a first ridge mesa 8 formed, on said substrate 2 said first ridge mesa 8 being covered on the top with at least an active layer 4 and provided at both lateral edges with current blocking layers 9, 10 of p-n reverse junction semiconductors arranged along the active layer for confining electric currents and a second ridge mesa 11, formed by said first ridge mesa 8 and said current blocking layers 9 10 and, provided at both lateral edges …
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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
- Filed December 14, 1992 and granted October 20, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 14, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 14, 2014.
- 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.