Method and apparatus for twisting a coated optical fiber during drawing from a preform
CA 2335836 A1 · Owner: Pirelli Cavi E Sistemi S.P.A. · Inventors: Roba, Giacomo Stefano; Pata, Roberto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for manufacturing an optical fiber (100) having low PMD comprises , the steps of: a) heating at least one end portion (3a) of a preform (3); (b) drawing an optical fiber (100) from a free end of said heated end portion (3a) along a fiber drawing axis (I-I); c) coating said optical fiber (100) with a suitable coating material; d) applying to said coated optical fiber (100) a torque about said fiber drawing axis (I-I); e) winding said coated optical fiber (100) onto a collecting spool (9). According to the invention step d) , is carried out by means of a pulley (16) supported upstream of said collecting spool (9) and rotated about the fiber drawing axis (I-I) said optical fiber …
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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 22, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 22, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 22, 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.