Half-band filter for a cellular group demultiplexer
CA 2122652 C · Owner: Ems Technologies Canada, Ltd. · Inventors: Shayan, Yousef; Soleymani, Mohammad Reza
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A half-band filter for cellular group, demultiplexer has a top half and a symmetrical bottom half. Each half consists of a plurality of shift registers adders, and multipliers connected in serial arrangement so as to produce a desired result at the output whereby the number of multipliers is reduced relative to the amount of multipliers in a conventional half-band filter.
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 May 2, 1994 and granted February 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 2, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 2, 2016.
- 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.