Measuring and testing – Fluid pressure gauge – Diaphragm
Reexamination Certificate
2007-04-03
2007-04-03
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Fluid pressure gauge
Diaphragm
C073S718000, C073S724000
Reexamination Certificate
active
11333637
ABSTRACT:
A pressure sensing device (10, 40) is shown having a ceramic capacitive sensing element (12) received in a chamber formed in a hexport housing (16). The hexport housing has a fluid passageway (16c) communicating with a recessed chamber (16d) formed in a bottom wall circumscribed by an annular platform shoulder (16e). A thin flexible metal diaphragm (18) is hermetically attached to the bottom wall along the platform shoulder. A curable adhesive resin having a thermal coefficient of expansion and modulus of elasticity appropriately matching that of sensing element (12), such as polyurethane, is cast between the sensing element (12) and the metal diaphragm (18) forming, when cured, a layer bonded to both members resulting in a sensor that is effective in monitoring negative as well as positive fluid pressures. In one embodiment a ring is used to define layer20laterally and in a second embodiment an insulator sleeve (44) and shield sleeve (42) which receives pressure sensing element (12) each have an open end with an inwardly extending lip (44b,42b) that define layer20laterally.
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patent: 6209398 (2001-04-01), Fowler et al.
patent: 6272927 (2001-08-01), Amatruda et al.
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patent: 6781814 (2004-08-01), Greene
Amore Alan G.
Attaset Vanvisa
Field David J.
Giasson Eric J.
Greene Stephen P.
Baumann Russell E.
Jenkins Jermaine
Lefkowitz Edward
Sensata Technologies, Inc.
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