US 5,171,430 A · Plastic filter

Abstract

This disclosure illustrates a replaceable filter assembly for fluids in which the filter has a shell formed from an injection molded threaded end and an integral blow molded closed end to form a unitary shell. A seal such as a flange is provided adjacent to the threaded end so that a pressure seal can be maintained. A filter medium is supported within the shell so as to direct fluid flow through it to remove contaminants. The shell can be formed from plastic materials such as polyester terephthalate (PET), polyether sulfone (PES), and polyether urethane (PEU). This construction enables an inexpensive filter assembly and, with transparent plastic materials, an indication of the contaminant removal activity within the filter.

Claims19

Dependent claims

A replaceable filter assembly for filtering contaminants from fluids having a pressure significantly different than the pressure existing around the exterior of the filter assembly, said filter assembly comprising:

a unitary outer shell formed from plastic material and having an open, threaded, injection molded end, and a closed end blow molded substantially to its final shape, said threaded end having outward facing threads,
a filtration medium means positioned within said shell,
means for supporting said filtration medium means within said shell,
means for directing fluid flow through said filtration medium means whereby contaminants are removed from fluid passing through said filtration medium means, and
sealing means coacting with said threaded injection molded end and adjacent said threads whereby said shell forms a pressure vessel effectively sealed around its open end when installed.

2 more elements

Dependencies are inferred from the claim text.

Plastic filter

Life of this patent

Plastic filter

Life of this patent

Abstract

Claims19