Method for sintering porous-glass material, method for manufacturing preform and optical fiber, and porous-glass material
CA 2363356 A1 · Owner: Shin-Etsu Chemical Co. Ltd. · Inventors: Yoshida, Makoto; Kamio, Takeshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for sintering a porous-glass material to form a glass base material, which is a base material for an optical fiber comprising: preparing a ring heater having an opening through, which the porous-glass material passes for heating the, porous-glass material;selecting the porous-glass material having an outer diameter (d) within a predetermined range the, predetermined range being determined based on an inner diameter (D) of the opening of the ring heater; and heating the porous-glass material in an atmosphere of dehydration gas and inert gas with the ring heater.
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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 November 15, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 15, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 15, 2023.
- 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.