Ceramic filter structure
CA 2065208 A1 · Owner: Turunen, Aimo · Inventors: Jantunen, Heli; Turunen, Aimo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1182-7, Abstract, The invention relates to a ceramic filter structure in, which ceramic materials with different electrical properties are used. When the filter is formed by ceramic blocks containing at least one transmission line resonator all blocks, can be made equally high by selecting for each block a ceramic material which has the same physical height although the resonance frequency is different. Then an optimum physical size regarding the packing density can be selected for the blocks.
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 April 6, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 6, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 6, 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.