Optical integrated circuit for bidirectional communications and method for producing the same
CA 2211760 A1 · Owner: Ozawa, Shoichi · Inventors: Ozawa, Shoichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an optical integrated circuit for bidirectional communications which is able to achieve a downsizing and high integration with the production cost thereof decreased. An optical waveguide circuit 20 is formed on a substrate 25 and a photo diode (PD) 8 is connected to the outgoing end 29 side thereof. The optical waveguide circuit 20 has a circuit of an optical wavelength division multiplexer which causes communication signal light (~É1) inputted from a bidirectional light input/output port 33 to be transmitted through a communication light selective transmission filter 24 and to be outputted from a communication light output port 34 and causes non-communication light …
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 July 30, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 30, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 30, 2019.
- 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.