Passive optical network
CA 2092298 C · Owner: Chuter, Jeremy Brian · Inventors: Chuter, Jeremy Brian; Clarke, Donald Eric Arthur; Hale, Michael Anthony
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A head-end station (1) is provided for a passive optical network system arranged to transmit downstream TDMA frames and receive upstream TDMA frames. The head-end station (1) comprises a TDMA master (5) and a plurality of optical stages (4a, 4b) connected in common to the TDMA master (5). The TDMA master (5) assembles incoming data into downstream TDMA frames and demultiplexes upstream TDMA frames. Each optical stage (4a 4b) is arranged to be connected to a different respective fibre network (3a, 3b) and includes an optical transmitter which modulates an optical signal with downstream TDMA frames from the TDMA master (5) together with an optical receiver arranged to detect an optical signal …
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 17, 1991 and granted December 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 17, 2013.
- 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.