Pressure transition indicator and vacuum insulation panel equipped therewith for signaling loss of vacuum
OwnerNeil Refsoninventor
Life of this patent
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Abstract
A remotely interrogatable pressure transition indicator (100) having a pressure sensitive element (110) interacting with a remotely interrogatable mechanical switch (120). The pressure sensitive element (110) is a hermetically sealed, gas impermeable, flexible walled sachet (110) containing a quantity of gas, operable for transitioning between inflated and deflated conditions induced by a change in external gaseous pressure experienced by the sachet (110). The sachet (110) interacts with the mechanical switch (120) to producing a first interrogatable value when the sachet (110) is inflated and a second interrogatable value when the sachet (110) is deflated.
Claims20
A remotely interrogatable pressure transition indicator, comprising:
- (a) a pressure sensitive element operable for transitioning between first and second conditions induced by a change in external gaseous pressure experienced by the pressure sensitive element, and
- (b) a remotely interrogatable mechanical switch operable for transitioning between (i) a first state producing a first interrogatable value wherein the first state is indicative of a pressure induced status of the pressure sensitive element in the first condition representing a first external pressure experienced by the pressure sensitive element, and (ii) a second state producing a second interrogatable value different from the first interrogatable value, wherein the second state is indicative of a pressure induced status of the pressure sensitive element in the second condition representing a second external pressure experienced by the pressure sensitive element, wherein the first external pressure is lower than the second external pressure.
Dependencies are inferred from the claim text.