Patent Yard Sign in
Expired Canadian patentCanada

Solid electrolytic capacitor and method for producing the same

CA 2278643 C · Owner: Showa Denko K.K. · Inventors: Furuta, Yuji; Konuma, Hiroshi; Monden, Ryuji

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

Open the CIPO record

Abstract From the Canadian patent

A solid electrolytic capacitor includes a valve acting metal having microfine pores, a dielectric film formed on a surface of the valve acting metal, and a solid electrolyte layer provided on the dielectric film, in which at least a portion of the solid electrolyte layer is of a lamellar structure. In particular, a solid electrolytic capacitor includes an electrically conducting polymer having a specified condensed ring structure containing (1) a solid electrolyte layer containing a sulfoquinone anion having a sulfo anion group and a quinone structure and other anion and (2) a solid electrolyte layer containing an anthracenesulfonate ion and other anion.

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 November 27, 1998 and granted February 7, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 27, 2018.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 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.
FiledNovember 27, 1998
GrantedFebruary 7, 2012
Term endedNovember 27, 2018
Patent numberCA 2278643 C
Classification (IPC)H01G9/15 +2 more

Timeline

Timeline From CIPO dates

1999200120032005200720092011201320152017Application filedNov 27, 1998Patent grantedFeb 7, 2012Term endedNov 27, 2018

Sources & verification

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