Planar waveguides
CA 2199513 C · Owner: Maxwell, Graeme Douglas · Inventors: Ainslie, Benjamin James; Maxwell, Graeme Douglas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Planar waveguides are produced by using radiation to write path regions into a photosensitive layer. Originally, the photosensitive layer had the same refractive index as the confining regions e.g. it consists of silica doped , with oxides of Ge and B. Composite path regions are produced by depositing a glass soot onto a partial region. On sintering the soot melts to fill up the empty spaces and thereby create a composite layer.
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 September 22, 1995 and granted August 27, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 22, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 22, 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.