Time duration indicator systems, and also products containing such indicator systems having a limited duration of use or life
                        
                            
                                申请人:NAARDEN INTERNATIONAL N.V.
                            
                            
                                公开号:EP0227167A1
                            
                            
                                公开(公告)日:1987-07-01
                            
                            
Time duration indicator systems comprising a porous inert carrier (4) and a volatile liquid, capable of reversibly changing the visual properties of the carrier. Such indicator systems can be used for products (1) having a limited duration of use or life.  
                            时长指示系统由多孔惰性载体(4)和挥发性液体组成,能够可逆地改变载体的视觉特性。这种指示系统可用于使用或寿命有限的产品(1)。