Tantalum containing glasses and glass ceramics
CA 2336619 A1 · Owner: Corning Incorporated · Inventors: Aitken, Bruce G.; Beall, George H.; Borrelli, Nicholas F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a glass matrix which includes 4-70 wt.% SiO2 0.5-20 wt.% Al2O3, 0-20 wt.% R2O, 0-30 wt.% R'O 8-85 wt.% Ta2O5, 0-40 wt.% , Nb2O5, and 0.01-1.0 wt.% R''2O3 where R2O + R'O is between about 2-35 wt.% Ta2O5 + Nb2O5 is between about 8-85 wt.% R is selected from a group , consisting of Li Na, K, and combinations thereof, R' is selected from a group consisting of Ba, Sr, Ca, Mg, Zn, Pb, and combinations thereof and R'' is a , rare earth element. The present invention also relates to use of the glass matrix in forming optic waveguides such as optic amplifiers. The present invention further relates to a transparent glass ceramic that contains pyrochlore, …
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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 June 21, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 21, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 21, 2021.
- 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
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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.