Method for producing highly pure glass preform for optical fiber
CA 1238821 A · Owner: Sumitomo Electric Industries, Ltd. · Inventors: Kanamori, Hiroo; Mizutani, Futoshi; Tanaka, Gotaro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for producing a glass preform for an optical fiber by an outside vapor-phase depostion method which comprises forming fine glass particles by jetting gaseous glass raw material and fuel gas from a first burner to deposit the particles on a seed rod to form a soot rod at such a temperature that a specific bulk density of the soot rod being formed is low and subsequently heating the soot rod by a second burner so as to increase the bulk density of the soot and then sintering the soot rod to obtain a transparent glass preform for an optical fiber by which method, a highly pure glass preform is produced in a good deposition yield without cracking.
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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
- Granted July 5, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 5, 2005.
- 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.