Method for producing glass preform for optical fiber
CA 1264614 C · Owner: Danzuka, Toshio · Inventors: Danzuka, Toshio; Ishiguro, Yoichi; Yokota, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract:, A method for producing a glass preform for an optical fiber by means at least two burners comprises jetting, a glass raw material containing SiCl4 from a first center burner and a hydrogen-containing silicon compound with larger reaction heat than SiCl4 from at least one second burner. The method involves flame hydrolyzing the glass raw material to synthesizing fine glass particles, depositing the fine glass particles on a starting member to form a porous soot preform and heating and sintering the soot preform to obtain a transparent glass preform. The method produces a large stable preform,and the bulk density of the preform is easily controlled.
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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 January 23, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 23, 2007.
- 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.