(19)
(11) EP 0 495 599 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.11.1992 Bulletin 1992/48

(43) Date of publication A2:
22.07.1992 Bulletin 1992/30

(21) Application number: 92300252.1

(22) Date of filing: 10.01.1992
(51) International Patent Classification (IPC)5: H05B 6/64
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI LU MC NL PT SE

(30) Priority: 17.01.1991 GB 9101085
15.07.1991 GB 9115294

(71) Applicant: TESCO STORES LIMITED
Waltham Cross, Hertfordshire EN8 9SL (GB)

(72) Inventors:
  • Andrews, Gordon
    Bromley, Kent BR2 0SZ (GB)
  • Hollingsworth, Brian, Dr.
    Royston, Herts. SG8 6EG (GB)
  • Rickson, Colin David
    Woburn Sands, Berks. MK17 8NN (GB)

(74) Representative: Marlow, Nicholas Simon 
Reddie & Grose 16, Theobalds Road
London WC1X 8PL
London WC1X 8PL (GB)


(56) References cited: : 
   
       


    (54) Microwave oven test device and method of use


    (57) There is disclosed a microwave oven test device, kit and method for testing the power output or heating performnace of a microwave oven. The test device comprises a thermometer having a strip (4) of liquid crystal areas (6), each activated to change colour at a characteristic temperature. A slidable cursor (8) carries a scale (12) indicating microwave oven power outputs or heating performances corresponding to temperatures indicated on the liquid crystal strip. A preferred device has a liquid crystal strip on either side of a card thermometer and a cursor carrying two scales. A first scale indicates power output and lies adjacent to the strip on a first side of the card and the second scale indicates heating performance and lies adjacent to the liquid crystal strip on the second side of the card. A method of using the device and a test kit comprising the device are also disclosed.






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