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Expired Canadian patentCanada

Non-radiative dielectric line and integrated circuit of the same

CA 2315399 C · Owner: Murata Manufacturing Co. Ltd. · Inventors: Saitoh, Atsushi; Takakuwa, Ikuo; Nishida, Hiroshi

CIPO record

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Abstract From the Canadian patent

In a non-radiative dielectric line, slots opposing each other are respectively formed on two conductive plates and a dielectric strip is disposed within both the slots to form a NRD guide. Convex portions "P" protruding in the lateral direction to the propagating direction of an electromagnetic wave are formed at a predetermined position of the dielectric strip 3 while concave portions "H" are formed on internal surfaces of the slots in the conductive plates 1 and 2 so as to mate the both of them with each other. Variations in characteristics due to the positional slippage of the dielectric strip and so forth are prevented and even, when the dielectric strip is produced by machining etc. …

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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 December 15, 1998 and granted August 12, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 15, 2018.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 15, 2020.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 15, 1998
GrantedAugust 12, 2003
Term endedDecember 15, 2018
Patent numberCA 2315399 C
Classification (IPC)H01P3/16 +1 more

Timeline

Timeline From CIPO dates

1999200120032005200720092011201320152017Application filedDec 15, 1998Patent grantedAug 12, 2003Term endedDec 15, 2018

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.