(19)
(11) EP 0 261 780 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
19.07.1989 Bulletin 1989/29

(43) Date of publication A2:
30.03.1988 Bulletin 1988/13

(21) Application number: 87306941.3

(22) Date of filing: 05.08.1987
(51) International Patent Classification (IPC)4A63F 3/06
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 22.08.1986 US 899424

(71) Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY
St. Paul, Minnesota 55133-3427 (US)

(72) Inventor:
  • Relyea, Keith E. Minnesota Mining and
    St. Paul Minnesota 55133-3427 (US)

(74) Representative: Baillie, Iain Cameron et al
c/o Ladas & Parry Altheimer Eck 2
80331 München
80331 München (DE)


(56) References cited: : 
   
     
    Remarks:
    The title of the invention has been amended (Guidelines for Examination in the EPO, A-III, 7.3).
     


    (54) Hidden image system


    (57) A sheet is provided which upon abrasion of one surface will reveal a preprinted message without removal of an opaque cover layer.





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