1
James W Derrick, Robert G Derrick: Non-clogging wear-reducing screen assembly for vibrating screening machine. Derrick Manufacturing Corporation, Joseph P Gastel, March 11, 1986: US04575421 (72 worldwide citation)

A non-clogging and wear-reducing screen assembly for a vibrating screening machine including a substantially rigid plate having upper and lower sides and having first and second pairs of opposite edges, attachment members formed integrally with a plate on a first pair of opposite edges for attachmen ...


2
James W Derrick, L Charles Matsch: Derrick Manufacturing Corporation, Joseph P Gastel, August 15, 1989: US04857176 (62 worldwide citation)

A molded polyurethane vibratory screen including a body having opposite side edge portions, upper and lower edge portions, an upper surface and a lower surface, a plurality of major and minor substantially parallel ribs extending between the upper and lower edge portions and substantially parallel t ...


3
James W Derrick: Derrick Manufacturing Corporation, Joseph P Gastel, April 11, 1989: US04819809 (34 worldwide citation)

A molded polyurethane vibratory screen including a body having opposite side edge portions, upper and lower edge portions, an upper surface and a lower surface, a plurality of major and minor substantially parallel ribs extending between the upper and lower edge portions and substantially parallel t ...