Waveguiding structure
CA 2095324 C · Owner: British Telecommunications Public Limited Company · Inventors: Maxwell, Graeme Douglas; Ainslie, Benjamin James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A planar waveguiding device has the cares of the fibre tails (12) directly connected to the path regions of the waveguiding structure. The devices are produced by attaching the fibre tails (l2) before the path layer is deposited. The direct connections are produced when the path layer is sintered.
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 November 5, 1991 and granted February 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 5, 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.