Measuring and testing – Fluid pressure gauge – Vibration type
Reexamination Certificate
2008-07-15
2008-07-15
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Fluid pressure gauge
Vibration type
Reexamination Certificate
active
11400688
ABSTRACT:
An acoustic pressure sensor includes a stack of one or more acoustically responsive elements which are contained within a housing. An external acoustic pressure to be sensed is transmitted to the stack via a diaphragm which exists in an end cap closing a top portion of the housing. The outer edge of the diaphragm is in direct contact with the outer edge of the housing. This area enhancement increases the basic sensitivity of the sensing stack without the need of a gap. The diaphragm allows flexure to occur in a controlled fashion. The housing is sealed at the top and bottom by end caps, the top end cap defining a diaphragm area, which diaphragm deflects to thereby apply pressure to the stack to convert acoustic signals into electrical signals.
REFERENCES:
patent: 4299117 (1981-11-01), Andrews et al.
patent: 5222049 (1993-06-01), Drumheller
patent: 6634227 (2003-10-01), Rutz et al.
Chyrywaty, III Walter
Erickson David J.
Howard IP Law Group PC
Jenkins Jermaine
Lefkowitz Edward
Lockheed Martin Corporation
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