Method of producing an optical fibre having a core which has a non-circular cross-section and double crucible for use in this method
CA 1187289 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Jochem, Cornelis M.G.; Severin, Petrus J.W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical glass fibre having a circular cross-section and having a core which has a non-circular cross-section is produced while using a double crucible, the outer crucible having been provided with a ring-shaped channel of which at least one of the boundary walls has a non-circular cross-section. The glass in the outer crucible is passed through this channel before it is contacted with the glass in the inner crucible.
Read the whole patent
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 May 21, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 21, 2002.
- 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.