Semiconductor laser device
CA 2011155 C · Owner: Sagawa, Misuzu · Inventors: Kajimura, Takashi; Sagawa, Misuzu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A semiconductor laser device including a plurality of oscillation stripes so that phase locked oscillation can be generated at adjacent oscillation stripes is disclosed, in which device dummy regions for transmitting a current uncontributive to laser oscillation are arranged on both sides of an oscillation stripe region containing the oscillation stripes.
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
- Filed February 28, 1990 and granted April 19, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 28, 2012.
- 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.