Air filter for extraction apparatus
AssigneesPhilip Arthur Mullins, Barbara Mullins, Robert Turner
InventorsPhilip Arthur Mullins, John Horsey
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Abstract
A filter for air extraction apparatus is disclosed, which is assembled from a porous material arranged to collect contaminants. The filter comprises a bag with a constricted inlet for receiving contaminated air. The bag is formed from a plurality of envelopes having filtering side walls and each of the envelopes has at least one orifice connected to an orifice of an adjacent envelope.
Claims20
A filter for air extraction apparatus assembled from a porous material arranged to collect contaminants, comprising
- a bag with a constricted inlet for receiving contaminated air, wherein
- said bag is formed from a plurality of envelopes having filtering side walls and each of said envelopes has at least one orifice connected to an orifice of an adjacent envelope.
An air extraction apparatus including a filter comprising a bag with a constricted inlet for receiving contaminated air, wherein
- said bag is formed from a plurality of envelopes, each of said envelopes has filtering side walls, and each of said envelopes has at least one orifice connected to an orifice of an adjacent envelope.
A method of manufacturing a filter for air extraction apparatus comprising a bag with a restricted inlet for receiving contaminated air, wherein said method comprises the steps of:
- (a) providing a plurality of sheets of a porous material arranged to collect contaminants;
- (b) defining an orifice in selected ones of said sheets;
- and
- (c) connecting said sheets to form a plurality of envelopes having filtering side walls such that each of said envelopes has at least one orifice connected to an orifice of an adjacent envelope.
Dependencies are inferred from the claim text.