Liquid purification or separation – With repair or assembling means
Reexamination Certificate
2004-09-10
2011-12-27
Prince, Fred (Department: 1778)
Liquid purification or separation
With repair or assembling means
C210S259000, C210S416100
Reexamination Certificate
active
08083939
ABSTRACT:
A screen nozzle for a media retention screen is disclosed which includes a nipple, a bottom cover, a top cover, and a cylindrical screen element sandwiched between the top and bottom covers. The top cover is secured to the bottom cover by means of a threaded rod extending from either the bottom cover or the nipple through the interior of the screen through an aperture in the top cover with the top cover being retained in place by a nut or the like. The nipple is secured to the bottom cover by swaging and the threaded rod is welded to the bottom cover. Assembling the screen element using an internal threaded rod has two substantial advantages over existing screen nozzles. The first advantage is that there are no external welds which may damage or deform or foul the screen and which are also are potential areas of weaknesses which may be subject to corrosion. Secondly the screen element may be replaced without removing the nozzle from the screen plate. This makes repair and replacement of the screen nozzles considerably easier and also cheaper, since the nipple itself does not need to be replaced.
REFERENCES:
patent: 2779478 (1957-01-01), Wahlin
patent: 4390478 (1983-06-01), Sheperd
patent: 5985142 (1999-11-01), Belden
patent: 6165357 (2000-12-01), Cormier
patent: 6332545 (2001-12-01), Izumi
patent: 6579458 (2003-06-01), Mickelat et al.
patent: 7501058 (2009-03-01), Lawrence, Sr.
patent: 2 391 853 (2003-07-01), None
patent: 1 161 977 (2001-12-01), None
patent: 2003-275527 (2003-09-01), None
International Search Report, Application No. PCT/AU2004/001230, Dated Oct. 19, 2004.
Patterson & Sheridan L.L.P.
Prince Fred
Weatherford Australia Pty Limited
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