Passive optical network
CA 2071493 C · Owner: Clarke, Donald Eric Arthur · Inventors: Clarke, Donald Eric Arthur
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) for a passive, optical network system arranged to transmit and receive downstream and upstream, multiplex data frames. The data frames include a plurality of basic frames (BF), each basic frame (BF) comprising a plurality of traffic bits and a plurality of control bits. The head-end station (1) includes a data receiver comprising a control processor (12), arranged to receive control data a control, data buffer (13, 14) which provides a parallel data input to the control processor, a traffic interface (15) and a serial-to-parallel converter (11). The converter (11) receives upstream TDMA multiplexed frames and the parallel output from the converter is, connected in …
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 January 23, 1991 and granted December 16, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 23, 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.