Appeal No. 95-1950
Application No. 08/061,928
APPENDIX
1. A method for collecting for image analysis a
selected quantity of particles having a known average size
above a threshold size and that are in a fluid medium,
comprising the steps of A. providing a flow path for the fluid
medium, with the particles carried therein, across a filter
device having a substantially uniform distribution of
apertures of substantially uniform size for blocking particles
above said threshold size and passing smaller particles,
B. applying a known fluid signal to the flow
path, including across said filter device,
C. measuring a parameter responsive to fluid
flow through said filter device due to said applied fluid
signal and which changes according to blockage of said filter
device by particles above said threshold size,
D. terminating said fluid signal in response
to a selected change in said measured parameter, and
E. transferring the particles collected on
said filter device, after said selected change in said
measured parameter, to an optical element for image analysis.
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