Optical fibres
CA 1194280 A · Owner: British Telecommunications Public Limited Company · Inventors: Ainslie, Benjamin J.; Rush, James D.; Beales, Keith J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
OPTICAL FIBRES", An optical fibre capable of monomode transmission in, and having a wavelength of zero dispersion in, the 1.55 µm window and having a core comprising silica and germanium dioxide and a cladding comprising silica is drawn from an appropriate preform at a temperature in the range from 1900°C to 2000°C. Fibres thus produced have low loss compared with fibres, drawn at higher temperature.
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 October 1, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 1, 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.