Measuring and testing – Fluid pressure gauge – Electrical
Reexamination Certificate
2005-09-20
2005-09-20
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Fluid pressure gauge
Electrical
C073S019050, C073S023200
Reexamination Certificate
active
06945119
ABSTRACT:
A heat loss gauge for measuring gas pressure in an environment includes a resistive sensing element and a resistive compensating element. The resistive compensating element is in circuit with the sensing element and is exposed to a substantially matching environment. An electrical source is connected to the sensing element and the compensating element for applying current through the elements. The current through the sensing element is substantially greater than the current through the compensating element. Measuring circuitry is connected to the sensing element and the compensating element for determining gas pressure in the environment to which the sensing element and compensating element are exposed based on electrical response of the sensing element and the compensating element.
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A gauge such as illustrated in FIG. 7 of the present application, but with a different current ratio and further including a parallel trim resistor such as in FIG. 9, was sold more than one year prior to Oct. 16, 2002 but after the priority date or dates for Claims 1-14.
Bills Daniel G.
Borenstein Michael D.
Ellington Alandra
Hamilton Brook Smith & Reynolds P.C.
Helix Technology Corporation
Lefkowitz Edward
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