Appeal No. 95-3208
Application 08/067,307
light scattering to measure the size of particles suspended in a
fluid medium.
The only independent claims 1 and 8 present in the
application are reproduced as follows:
1. In an apparatus for determining the size of particles
suspended in a medium, said apparatus being of the type
having a means for producing a beam of light;
a means for exposing the particles to the beam of light,
whereby the light which contacts the particles is scattered;
and a means for detecting the light over a given collection
angle after it has passed through the means for exposing the
particles to the beam of light, the improvement comprising:
a spatial filter for reducing the collection angle
to less than about 3E.
8. A method for determining the size of a particle
suspended in a medium comprising:
(a) passing the medium containing the particle
through a beam of light, so that the light which
contacts the particle will be scattered;
(b) detecting the light which was not scattered by
the particle;
(c) deterring the light which was scattered by the
particles from being detected, such that only
light which falls within a collection angle of 3E
or less is detected; and
(d) determining the size of the particle from the
decrease in light detected as the particle passed
through the beam of light.
The references relied on by the Examiner are as follows:
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