Semiconductor laser amplifiers
CA 2045405 C · Owner: Isaac, Joseph James · Inventors: Spurdens, Paul Charles; Cooper, David Martin; Cole, Simon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A semiconductor laser amplifier includes both a waveguide layer (3) and an active layer (4). In use an optical wave in the, active layer (4) interacts with the waveguiding layer to reduce the polarisation sensitivity of the amplifier. A short thick active, layer is not required, typical dimensions being 250 or 500 µm long by 0.2 µm high. The mesa (15) is typically about 2 µm wide but, may be wider.
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 January 15, 1990 and granted October 21, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 15, 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.