Optical branching device
CA 2134693 C · Owner: Matsuura, Yuji · Inventors: Matsuura, Yuji; Kanamori, Hiroo; Sasaoka, Eisuke
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical branching device according to present invention comprises a cladding member, a first core member a second core member, and a third core member. These core members are isolated each other, and the with of a edge face of the first core member is greater than total length of the widths of second and third core members' terminals facing to the first core member and a gap between the second and third core members.
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 October 31, 1994 and granted August 13, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 31, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2016.
- 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.