(19)
(11) EP 0 149 784 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.02.1987 Bulletin 1987/09

(43) Date of publication A2:
31.07.1985 Bulletin 1985/31

(21) Application number: 84115108

(22) Date of filing: 10.12.1984
(84) Designated Contracting States:
CH DE FR GB LI NL SE

(30) Priority: 16.01.1984 US 571295

(71) Applicant: ALLIED CORPORATION
 ()

(72) Inventors:
  • Razzaq, Abdul
     ()
  • Marshall, Edward C.
     ()

   


(54) Process for transferring color-changing coating uniformly onto indicator and transfer ribbon therefore


(57) A color-changing coating is transferred by pressure in a coating station from a transfer ribbon onto a selected region of an indicator. The continuous coated ribbon and a continuous length of indicators are each conveyed through the coating station, generally in a parallel direction. Pressure may be applied by rollers forming transferred shapes of coating such as bars extending in the direction of conveyance. The color changing coating may contain a component such as a compound with conjugated acetylenic bonds which changes color as a cumulative measurement of temperature exposure.






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