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US 6,164,457 AGranted
Filter cartridge having a filter element inserted in a flexurally rigid frame
AssigneeFirma Carl Freudenberg
InventorUlrich Schlor
Life of this patent
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Abstract
A filter cartridge having a flexurally rigid frame with a filter element inserted therein is formed of a frame composed of a blank in a single piece, and is folded inward forming a double-walled box profile.
Claims13
A filter cartridge, comprising:
- a flexurally rigid frame;
- and
- a filter element inserted in the flexurally rigid frame, wherein:
- the flexurally rigid frame is formed from a single-piece blank that is folded inward to form a double-walled box profile, and
- the single-piece blank is joined to the filter element.
2 more elements
A method for producing a frame for a filter cartridge, comprising the steps of:
- forming a single-piece blank from a flat workpiece using an industrial plotter;
- and
- folding the single-piece blank inward to form a double-walled box profile.
Dependencies are inferred from the claim text.