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US 4,071,937 AGranted
Filter cartridge with folded filter sheath
AssigneeSintermetallwerk Krebsoge GmbH
InventorRainer Rohlig
Life of this patent
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Abstract
A filter cartridge has a fluid-permeable support body formed externally with ribs and is closely surrounded by a "folded" (e.g. corrugated) sheath of sintered material. The support body may likewise be formed of sintered material and preferably the sheath and support body are sintered together.
Claims1
A method of making a filter cartridge comprising the steps of:
- isostatically pressing sinterable material against a smooth core to form a tubular support body having a plurality of support ribs extending therealong;
- isostatically pressing a sinterable filter sheath substantially of constant wall thickness against said support body;
- pressing a headpiece onto said support body;
- and
- sintering said sheath, said support body and said headpiece simultaneously to bond them together.
2 more elements
Dependencies are inferred from the claim text.