(19)
(11) EP 0 438 254 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.11.1991 Bulletin 1991/46

(43) Date of publication A2:
24.07.1991 Bulletin 1991/30

(21) Application number: 91300254.9

(22) Date of filing: 14.01.1991
(51) International Patent Classification (IPC)5: H01K 1/16
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI LU NL SE

(30) Priority: 16.01.1990 GB 9000964

(71) Applicant: GE LIGHTING LIMITED
Enfield, Middlesex EN1 1SB (GB)

(72) Inventors:
  • Letchford, John Albert
    Enfield, Middlesex (GB)
  • Lee, Douglas Gordon Lewis
    Buckhurst, Essex (GB)

(74) Representative: Sanders, Peter Colin Christopher 
BROOKES & MARTIN High Holborn House 52/54 High Holborn
London WC1V 6SE
London WC1V 6SE (GB)


(56) References cited: : 
   
       


    (54) Circular heater lamp


    (57) The invention relates to a circular heater lamp including a curved bulb the curved main body portion of which houses a cylindrical filament (5). Each end of the filament is connected to a respective plug member housed in a respective end portion of the bulb, each end portion having a radius of curvature which differs to that of the curved main body portion. Each of the plug members is formed with a male or female conical wound section 4 which engages the inside or outside of the filament (5).






    Search report