Wave-guiding structure with lasing properties
CA 2082940 C · Owner: Craig-Ryan, Susan Patricia · Inventors: Ainslie, Benjamin James; Craig-Ryan, Susan Patricia
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Optical wave guides, e.g. fibres, for use as photonic amplifiers have a path region partly or preferably, wholly composed, as a silica/germania glass with 0.1 to 5000 ppm mole of Er3+ as a lasing additive and alumina to adjust the bandwidth the, Ge:Al mole ratio being more than 2.8 e.g. 1:0.001 to 0.25. it is surprising that low amounts of alumina have a useful and significant effect on the lasing bandwith whereby frequency division multiplex is facilitated.
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 May 16, 1991 and granted February 10, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 16, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 16, 2013.
- 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.