Optical wave guides
CA 1325121 C · Owner: British Telecommunications Public Limited Company · Inventors: Davey, Steven Terrence; Ainslie, Benjamin James; Craig, Susan Patricia
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Glass fibre suitable for use as the core in fibre lasers and/or amplifiers has a core which consists of a continuous glass phase and a disperse phase of crystallites. The preferred crystallites are the oxides and phosphates of rare earth metals, eg Nd203 and NdP5014. The small size concentration and distribution of the crystallites keeps the attenuation down to acceptable levels.
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
- Granted December 14, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 14, 2010.
- 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.