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Expired Canadian patentCanada

Power capacitor

CA 1078475 A · Owner: Kraftwerk Union Aktiengesellschaft · Inventors: Cirkel, Hans-Jurgen

CIPO record

Overview

Drawings and full text

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

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Abstract From the Canadian patent

Power capacitor with minimal self-inductance includes a stack of metal layers mutually superimposed perpendicularly to a given axis with, respective layers of insulation disposed between mutually adjacent metal layers of the stack, the metal layers and the insulation layers being formed with mutually aligned cut-outs in vicinity of the given axis so as to form a free space within the stack, respective surface portions of alternating layers of the metal layers projecting into the free space above one another as electrodes of given common polarity the surface portions of the metal, layers of respective opposite common polarity being disposed symmetrically with respect to the given axis in the …

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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

  • Granted May 27, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 27, 1997.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedMay 27, 1980
Term endedMay 27, 1997
Patent numberCA 1078475 A
Classification (IPC)H01G4/30 +1 more

Timeline

Timeline From CIPO dates

198119831985198719891991199319951997Patent grantedMay 27, 1980Term endedMay 27, 1997

Sources & verification

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