Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Reexamination Certificate
2005-09-27
2005-09-27
Heitbrink, Jill L. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
C264SDIG004, C425S556000, C425SDIG005
Reexamination Certificate
active
06949214
ABSTRACT:
A filter having a substantially cylindrical or slightly tapered body design which has a plurality of elongated apertures formed therethrough. Each aperture is defined side to side by a pair of elongated, wedge-like rib members disposed one on each side of each aperture, and top to bottom by a pair of cross members which present a substantially square top side and an angularly declining bottom side. The end effect is a substantially rectangular entry aperture for fluid flow with the exception of the declining bottom side which promotes smooth, low resistance entry flow. The present invention is also directed to a method of manufacture of filters having the above-described characteristics. In particular, the preferred method involves an injection molding process in which a molten plastic (such as high-density polyethylene, HDPE) is injected into a two-part mold. The mold generally comprises a smooth, substantially cylindrical cavity and a notched and grooved core which is inserted into the cavity in a partial surface to surface contact relationship to complete the filter mold. Due to the extremely close tolerances required by a such a core and cavity surface to surface relationship, unique mold alignment modifications were also developed.
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Butterfield Laura M.
Gambro Inc.
Heitbrink Jill L.
Merkling John R.
O'Connor Edna M.
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