Vacuum / pressure indicator

Abstract

A device for indicating the current pressure state within a closed container, the device having at least a first substrate having a first set of displacement abilities; at least a second substrate having a second set of displacement abilities different from the displacement abilities of the first substrate; wherein the first and second substrates are held in separable abutment and displacement of one of the first and second substrates causes separation from such abutment producing an indication of either vacuum or pressure within the container. Also included is a method for indicating a pressure differential between the pressure in the interior of a closed container and the ambient pressure that includes deploying a pressure differential indicator on the container such that a first side is exposed to the interior of the container and a second side is exposed to the ambient pressure; and creating a pressure differential within the container.

1 . A device for indicating the current pressure state within a closed container, the device comprising:
 (a) at least a first substrate layer having a first set of displacement abilities;   (b) at least a second substrate layer having a second set of displacement abilities that are different from said displacement abilities of said first substrate;   
       wherein said first and second substrates are held in separable abutment such that displacement of one of said first and second substrate layers causes separation from such abutment thereby producing an indication of either vacuum or pressure within the container. 
     
     
         2 . The device of  claim 1 , wherein said first and second sets of displacement abilities are flexibility such that one of said first and second substrate layers is a flexible layer and another one of said first and second substrate layers is a rigid layer. 
     
     
         3 . The device of  claim 1 , wherein said indication is a change in color. 
     
     
         4 . The device of  claim 1 , wherein said indication is a change in visible words. 
     
     
         5 . The device of  claim 1 , wherein said indication is a visual change emitted by an electronic component. 
     
     
         6 . The device of  claim 1 , wherein said indication is an auditory change emitted by an electronic component. 
     
     
         7 . The device of  claim 1 , wherein said first and second sets of displacement abilities are flexibility such that one of said first and second substrate layers is more flexible than another one of said first and second substrate layers. 
     
     
         8 . The device of  claim 1 , wherein said first and second sets of displacement abilities are displacement of rigid substrate layers such that one of said first and second substrate layers is deployed in a fixed position while another one of said first and second substrate layers is displaceable between an abutment position and a non-abutment position. 
     
     
         9 . A method for indicating a pressure differential between the pressure in the interior of a closed container and the ambient pressure, the method comprising:
 (a) deploying a pressure differential indicator on the container such that a first side of said pressure differential indicator is exposed to the interior of the container and a second side of said pressure differential indicator is exposed to the ambient pressure, wherein the device includes:
 (i) at least a first substrate layer having a first set of displacement abilities; 
 (ii) at least a second substrate layer having a second set of displacement abilities that are different from said displacement abilities of said first substrate; 
   
       wherein said first and second substrates are held in separable abutment such that displacement of one of said first and second substrate layers causes separation from such abutment thereby producing an indication of a pressure differential within the container; and
 (b) creating a pressure differential within the container.