Directional particle filter

Details Directional particle filter Directional particle filter

1990-04-19

1991-04-30

Berman, Jack I.

Radiant energy

Radiation controlling means

2505151, 2504961, 2504921, 2504981, 350276R, 350276SL, 350319, 350354, 350407, G02B 522

Patent

active

050120808

ABSTRACT:
The invention features a directional particle filter for selectively blocking specific particles whose projected paths intersect a predetermined point relative to the filter. This filter includes a plurality of non-intersecting surfaces arranged in layers, each surface including multiple units, combinations of the units forming passing and blocking tuples, or ordered sets of units. Each tuple includes one unit from each surface. The blocking and passing tuples are arranged so that the projected path of each specific particle through the filter that intersects the predetermined point traverses a blocking tuple and the projected paths of specific particles through the filter that do not intersect the predetermined point traverse both passing and blocking tuples. Methods of selectively blocking specific particles and constructing a directional particle filter are also featured.

REFERENCES:
patent: 1800044 (1931-04-01), Baird
patent: 2439295 (1948-04-01), Hammond et al.
patent: 3411007 (1968-11-01), Thompson
patent: 3435246 (1969-03-01), Webb
patent: 3706494 (1972-12-01), Gardner
patent: 3741631 (1973-06-01), Laing
patent: 3768911 (1973-10-01), Erickson
patent: 4176276 (1979-11-01), Kaul et al.

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