Optical cable television transmission system
CA 2034233 C · Owner: Alcatel N.V. · Inventors: Krimmel, Heinz; Heidemann, Rolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is based on the problem of transmitting a frequency-division multiplex signal occupying a broad frequency band, e.g. the cable television frequency band of 47-440 MHz over an, optical waveguide transmission section. According to the invention, in the transmitting unit the whole, frequency band to be transmitted is divided into two sub-bands (FB1, FB2), and the lower sub-band (FB1) is converted by means of single-sideband amplitude modulation of a high-frequency carrier (f0) into a higher-frequency transmission frequency band e.g. 497-, 688 MHz, which is less than one octave in width based, on its lowest frequency. The lower sub-band (FB1) and the transmission frequency band …
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 15, 1991 and granted April 26, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 15, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 15, 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.