Optical fiber
CA 1262833 C · Owner: Aoki, Tetsuji · Inventors: Aoki, Tetsuji; Nakasuji, Masaaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, The invention provides an optical fiber having a first covering surrounding the optical fiber and a second covering surrounding the first covering. The first covering comprises a material having a Young's modulus at -30°C which is not greater than ten times that at 23°C. The fiber has a small increase of attenuation of light transmission at low temperatures and also has a small increase of attenuation of light transmission due to lateral pressures not only at room temperature but also at low temperatures.
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 November 14, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 14, 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.