Method for producing glass preform for optical fiber
CA 1258408 A · Owner: Sumitomo Electric Industries, Ltd. · Inventors: Tanaka, Gotaro; Mizutani, Futoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract:, A glass preform for an optical fiber having a homogeneous distribution of bulk density in its radial direction is produced by a method comprising forming fine glass particles by jetting a gaseous glass material and a fuel gas from a burner. The glass particles are deposited on a seed rod to form a soot rod, while measuring the temperature of the part of the soot rod on which the glass particles are being deposited. This temperature is kept constant by varying the distance of the rod from the burner. The soot rod is finally sintered to obtain a transparent glass preform. The result is a preform of improved and, particularly, more uniform, characteristics.
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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 August 15, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 15, 2006.
- 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.