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Expired Canadian patentCanada

Impregnants for metalized paper electrode capacitors

CA 1161507 A · Owner: General Electric Company · Inventors: Grahame, Frederick W.

CIPO record

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Abstract From the Canadian patent

Abstract of Disclosure An electrical capacitor has a pair of electrodes which are metallized paper strip electrodes with a, synthetic resin film dielectric between the electrodes. The electrodes and the dielectric are wound in a roll mounted in a casing, and impregnated with dielectric fluid which is a blend of an aromatic hydrocarbon selected from the group consisting of phenyl xylyl ethane mono-, isopropyl biphenyl, and phthalate ester. The use of this blend for a dielectric fluid improves the electrical performance of the capacitor.

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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 January 31, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 31, 2001.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 5, 1981
GrantedJanuary 31, 1984
Term endedJanuary 31, 2001
Patent numberCA 1161507 A
Classification (IPC)H01G4/22 +2 more

Timeline

Timeline From CIPO dates

1982198419861988199019921994199619982000Application filedJune 5, 1981Patent grantedJan 31, 1984Term endedJan 31, 2001

Sources & verification

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