Intermediate frequency filter for television receiver
CA 1112728 A · Owner: Matsushita Electric Industrial Co. Ltd. · Inventors: Tabuchi, Toshihide; Tsumura, Masakatsu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a band pass filter having a plurality of quarterwavelength resonators, at least two of the quarter-wavelength resonators are substantially shielded from each other by a partition wall. These two resonators are electrically connected to each other through a line insulated from the casing so as, to improve the cut off characteristic of the filter namely, to cut off the applied signal in a high frequency region of the band being filtered more rapidly than in a low frequency region.
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
- Granted November 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 17, 1998.
- 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.