Silica glass material having second order optical nonlinearity and its manufacturing method
CA 2267861 C · Owner: Takahashi, Masahide · Inventors: Fujiwara, Takumi; Ikushima, Akira; Takahashi, Masahide
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The Ge concentration in a core part (10a) is higher than 12 mol.% and not higher than 30 mol.%. The voltage which is applied at the time of ultraviolet radiation excitation polling is within a range of 1 x 10 5 - 8 x 10 5 V/cm. Thus, SiO2 glass material has a nonlinear optical constant d of not less than 2.5 pm/V. Therefore an optical functional , device such as an optical switch can be made of the glass material.
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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 29, 1997 and granted August 20, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 29, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 29, 2019.
- 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.