Classifying – separating – and assorting solids – Sifting – Elements
Reexamination Certificate
2008-02-15
2011-11-01
Matthews, Terrell (Department: 3653)
Classifying, separating, and assorting solids
Sifting
Elements
C209S392000, C209S393000, C209S404000, C209S405000
Reexamination Certificate
active
08047380
ABSTRACT:
The invention concerns screen panels of the kind used in vibratory screening operations. According to the invention, the screen panels (10) include recycled polyurethane, typically that recovered from worn screen panels. In one particular embodiment in which the panel has an upper, perforated screening section (16.1) for performing a screening action and an operatively lower section (16.2) beneath the screening section, the upper section is of molded, virgin polyurethane and the lower section comprises a reinforcing frame (12) and recycled polyurethane molded about the reinforcing frame. The invention envisages the use of blends of virgin and recycled polyurethane as well as method of manufacturing screen panels and methods of handling worn screen panels.
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UK Search Report received in corresponding Application No. GB0805249.0 dated Jul. 17, 2008.
Matthews Terrell
Screenex Manufacturing (Pty) Ltd.
Wong, Cabello, Lutsch, Rutherford & Brucculeri L.L.P.
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