Low attenuation, high strength optical fiber with silica filament core
CA 1104347 A · Owner: E. I. Du Pont De Nemours And Company · Inventors: Trehu, Yves M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Low attenuation high strength optical fiber is made, by drawing a silica filament core at a temperature from 2040°C. to 2140°C. and melt coating onto it cladding polymer having an index of refraction lower than that of the silica core by extrusion at a draw-down ration from 1.2 to 2Ø
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 July 7, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 7, 1998.
- 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.