Optical coupler
CA 2190075 C · Owner: Uemura, Yasuo · Inventors: Uemura, Yasuo; Fukumura, Kazuyuki; Umehara, Etuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical coupler to be used for optical telecommunications is disclosed, characterized by portions of exposed optical fiber sections located immediately adjacent to and outside the respective clots of the first adhesive agent as viewed from the welded optical fiber section being coated by a third adhesive agent having a Young's modulus smaller than that of the first adhesive agent. It comprises exposed optical fiber sections formed by removing the coating layer of each of a plurality of coated optical fibers for a given length; a welded optical fiber section formed by welding together and stretching portions of said exposed optical fiber sections; an inner reinforcing member accompanying …
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 November 12, 1996 and granted January 7, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 12, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2018.
- 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.