Liquid purification or separation – Particulate material type separator – e.g. – ion exchange or... – Particular liquid receiving means or foraminous bed retainer
Reexamination Certificate
2006-07-11
2006-07-11
Cintins, Ivars C. (Department: 1724)
Liquid purification or separation
Particulate material type separator, e.g., ion exchange or...
Particular liquid receiving means or foraminous bed retainer
C210S541000
Reexamination Certificate
active
07074329
ABSTRACT:
A lid for an underdrain block that has a top surface defining an opening for receiving fill material. The top surface forms a ridge circumscribing the opening, the lid comprising a top, a bottom and a peripheral edge, the peripheral edge comprising a rim adapted to interlock with the ridge. The ridge of the underdrain block can have a flange perpendicular to the top surface and the rim on the lid is adapted to tightly fit over the flange so that the rim interlocks with the flange. Alternatively, the underdrain block for a filter system comprises a hollow plastic housing comprising a top wall that defines an opening for receiving the fill material. The top wall forms a ridge surrounding the opening and the lid seals the opening in the top wall. The lid comprises a peripheral edge that forms a u-shaped rim. The u-shaped rim has a locking means to tightly fit over the ridge so that the rim interlocks with the ridge so as to seal the opening.
REFERENCES:
patent: 667005 (1901-01-01), Davis
patent: 1891061 (1932-12-01), Friend et al.
patent: 2263964 (1941-11-01), Camp
patent: 2267918 (1941-12-01), Hildabolt
patent: 3178026 (1965-04-01), Christy
patent: 4206845 (1980-06-01), Christian
patent: 4564450 (1986-01-01), Piper et al.
patent: 4783261 (1988-11-01), Lingle
patent: 4882053 (1989-11-01), Ferri
patent: 4887735 (1989-12-01), Dudzik
patent: 4923606 (1990-05-01), Gresh et al.
patent: 5149427 (1992-09-01), Brown et al.
patent: 5232592 (1993-08-01), Brown et al.
patent: 5269920 (1993-12-01), Brown et al.
patent: 5468273 (1995-11-01), Pevzner et al.
patent: 541011 (1921-09-01), None
patent: 2554009 (1983-10-01), None
Savage E. Stuart
Slack David C.
Cintins Ivars C.
D'Ambrosio Jo Katherine
D'Ambrosio & Associates PLLC
Tetra Technologies, div Capital Controls, Severn Trent Services
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