Fibre optic telephone loop network
CA 2123414 C · Owner: Bears, James A. · Inventors: Bears, James A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel fibre optic telephone loop networks are disclosed. In the networks single mode fibre optics are used for feeder and distribution segments of the loop but multimode fibre optics are used for the drops. The use of the multimode fibre optics has permitted the use of less costly optoelectronic devices. Surface light emitting diodes are such economical but reliable parts. Fibre service terminals located near subscriber premises convert single mode operation to the multimode operation. The networks are relatively easy to install and upgrade and are very economically competitive with other known FTTC and FTTH schemes. In a further embodiment, the fibre service terminals have microprocessor …
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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 December 17, 1992 and granted January 19, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 2014.
- 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.