Valves and valve actuation – Fluid actuated or retarded – Flexible wall expansible chamber reciprocating valve actuator
Reexamination Certificate
2005-08-30
2005-08-30
Jacyna, J. Casimer (Department: 3751)
Valves and valve actuation
Fluid actuated or retarded
Flexible wall expansible chamber reciprocating valve actuator
C251S367000
Reexamination Certificate
active
06935608
ABSTRACT:
A microvalve and a method of forming a diaphragm stop for a microvalve. The microvalve includes a first layer and a diaphragm member to control the flow of fluid through the microvalve. The method comprises the step of forming a contoured shaped recess extending inward from a surface of the layer by using a laser to remove material in a series of areas, at successively greater depths extending inward from said surface. Preferably, the recess has a dome shape, and may be formed by a direct-write laser operated via a computer aided drawing program running on a computer. For example, CAD artwork files, comprising a set of concentric polygons approximating circles, may be generated to create the dome structure. The laser ablation depth can be controlled by modifying the offset step distance of the polygons and equating certain line widths to an equivalent laser tool definition. Preferably, the laser tool definition is combined with the CAD artwork, which defines a laser path such that the resulting geometry has no sharp edges that could cause the diaphragm of the valve to tear or rupture.
REFERENCES:
patent: 5660370 (1997-08-01), Webster
patent: 6073482 (2000-06-01), Moles
patent: 6607907 (2003-08-01), McNeely et al.
patent: 6715733 (2004-04-01), Wang et al.
Balch Ernest W.
Claydon Glenn S.
Jacyna J. Casimer
Lockheed Martin Corporation
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