Laser
CA 2181808 C · Owner: British Telecommunications Public Limited Company · Inventors: Armitage, Jonathan Richard; Wyatt, Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high power monomode laser arrangement is able to manipulate the output from a high power laser diode array pump source (3) using a computer-generated hologram (4) to launch a high proportion of the pump source light into a multimode fibre portion including input reflector (6). A monomode fibre portion (2) with the same fundamental-mode size as the multimode fibre portion (1) is optically coupled to the multimode fibre portion and includes a reflector (5) which reflects only the fundamental mode of the multimode and monomode fibre portions. The fundamental mode reflection forced by the monomode fibre portion (2) provides the feedback necessary to force predominantly fundamental mode …
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 27, 1995 and granted October 17, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 27, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 2017.
- 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.