Optical fiber
CA 2006847 C · Owner: Honjo, Makoto · Inventors: Yamanishi, Toru; Honjo, Makoto; Kakuta, Tatsuya
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical fiber comprises a light-guiding glass fiber and a coating around the glass fiber. The coating consists of at least two layers of polyorganosiloxane resin compositions having a ladder portion and a linear portion. The ratio of the ladder portion to the linear portion in one layer (the outer layer) is different from (smaller than) that in the other layer (the inner layer). The resulting fiber has improved strength and thermal resistance.
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
- Filed December 28, 1989 and granted November 18, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 28, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 28, 2011.
- 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.