Photoinduced grating in b2o3 containing glass
CA 2117682 C · Owner: Ipg Photonics Corporation · Inventors: Williams, Douglas Lawrence; Armitage, Jonathan Richard; Maxwell, Graeme Douglas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It has been demonstrated that B containing glasses are sensitive to radiation in the band 225-275 nm and therefore, B2O3, glasses are particularly adapted to receive refractive index modulation,e.g. to make reflection gratings. Glasses containing SiO2 and B2O3 are particularly suitable when the grating is to be localised in the cladding of a fibre. Glasses containing SiO2, GeO2, and B2O3 are suitable when the grating is in the path region of a waveguide e.g. in the core of a fibre.
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 June 24, 1993 and granted September 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 24, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 24, 2015.
- 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.