(19)
(11) EP 0 386 941 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.04.1992 Bulletin 1992/15

(43) Date of publication A2:
12.09.1990 Bulletin 1990/37

(21) Application number: 90302191.3

(22) Date of filing: 01.03.1990
(51) International Patent Classification (IPC)5: H01T 13/40, H01T 21/02
(84) Designated Contracting States:
AT BE CH DE ES FR GB IT LI NL SE

(30) Priority: 06.03.1989 US 320107

(71) Applicant: McDOUGAL, John A.
Detroit, MI 48215 (US)

(72) Inventor:
  • McDOUGAL, John A.
    Detroit, MI 48215 (US)

(74) Representative: Senior, Alan Murray et al
J.A. KEMP & CO., 14 South Square, Gray's Inn
London WC1R 5LX
London WC1R 5LX (GB)


(56) References cited: : 
   
       


    (54) Spark plug and method


    (57) A spark plug with integral electrical components for producing a spark with an increased size and a larger resulting flame kernel in an internal combustion engine. One or more coils may be built into the spark plug for creating a magnetic field in the vicinity of the spark. This magnetic field has the effect of bending and rotating the spark in a circular motion. Also, a capacitor may be incorporated into the spark plug to increase the intensity of the spark. A method of producing such a spark plug utilizes a cermet ink applied to the ceramic spark plug insulator before the insulator is completely hardened. The cermet ink may be used to create monolithic spark plug electrodes, integrated coils and integrated capacitors. The method may also be used to create monolithic electrically conductive paths through any solid dielectric material.







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