Apparatus for blocking a d.c. component of a signal
CA 2248311 C · Owner: Couch, Nigel · Inventors: Couch, Nigel; Seymour, Colin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus for blocking a d.c. component of a signal comprises an electrically conductive signal path (1, 2) having a gap (3) in it preventing direct current flow across the gap, and an electrically conductive element (4) spaced from the path by a body (5) of dielectric material the element (4) being located , and dimensioned such that in use an a.c. signal is coupled from the signal path (1) into the element (4) at one side of the gap and from the element (4) , into the signal path (2) at the other side of the gap. The apparatus includes a quarter wavelength earthing strap between the signal path and ground potential. The apparatus includes means for providing an a.c. signal feed into …
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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 March 3, 1997 and granted January 22, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 3, 2019.
- 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
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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.