Optical communication system
CA 2233291 C · Owner: Wake, David · Inventors: Wake, David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical distribution system is used for a signal to be transmitted at radio frequencies, for example to mobile telephone users. High frequency (LO) and Intermediate Frequence (IF) signals are modulated onto optical supercarriers. The optical signals are distributed via an optical network to one or more remote sites. An integral mixer/detector at the remote site both mixes the signals and converts them to the electrical domain thereby generating the RF , electrical signal required for transmission. In a preferred embodiment the , mixer/detector is a Heterojunction Bipolar Transistor.
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 11, 1996 and granted January 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 11, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 11, 2018.
- 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.