This disclosure reports embodiments of a fluid filter for ESD mitigation having a conductive polymer sleeve. Embodiments of this filter may include a conductive sleeve and tie bands to mitigate electrostatic discharge.

A water purifying filter has a cylindrical inner housing to receive a filter therein, and an outer housing to receive the inner housing. The inner housing and the outer housing are spaced apart from each other to form an insulation space configured to suppress heat transfer and to reduce the filter freezing inside the inner housing.

A water purifying filter has a cylindrical inner housing to receive a filter therein, and an outer housing to receive the inner housing. The inner housing and the outer housing are spaced apart from each other to form an insulation space configured to suppress heat transfer and to reduce the filter freezing inside the inner housing.

A freezing resistant liquid filter including a housing having a liquid inlet and a liquid outlet and a freezing compensating filter element disposed within the housing and including a folded filter medium having a plurality of interstices and freezing compressible elements located at the interstices.

A freezing resistant liquid filter including a housing having a liquid inlet and a liquid outlet and a freezing compensating filter element disposed within the housing and including a folded filter medium having a plurality of interstices and freezing compressible elements located at the interstices.

A fracture shielded filter tool including a mandrel, a filtration material disposed in a position relative to the mandrel to filter a fluid moving between an exterior of the mandrel and an interior of the mandrel, and a shield adjacent the filtration material and positioned to protect the filtration material from fluid associated with a fracture operation. A method for fracturing including running the tool to a target location, initiate a fracturing operation, shielding the filtration material from fluid associated with the fracturing operation and removing the shield thereby allowing fluid flow through the filtration material. A borehole system including a borehole in a subsurface formation, a string in the borehole and a tool disposed as part of or within the string.

A fracture shielded filter tool including a mandrel, a filtration material disposed in a position relative to the mandrel to filter a fluid moving between an exterior of the mandrel and an interior of the mandrel, and a shield adjacent the filtration material and positioned to protect the filtration material from fluid associated with a fracture operation. A method for fracturing including running the tool to a target location, initiate a fracturing operation, shielding the filtration material from fluid associated with the fracturing operation and removing the shield thereby allowing fluid flow through the filtration material. A borehole system including a borehole in a subsurface formation, a string in the borehole and a tool disposed as part of or within the string.

A fuel pre-filtering element may comprise a casing provided with a fuel outlet, an internal tube, an upper annular element, a lower annular element, a filtering element and a cover. The filtering element may be arranged around the internal tube The upper and lower annular elements may be respectively fixed to the upper and lower ends of the filtering element The filtering element may be arranged inside the casing such that the internal tube establishes a contact with the fuel outlet, the upper annular element is arranged around the fuel outlet and in contact with an upper surface of the casing, and the upper annular element is deformed and forms an annular projection. The annular projection may establish a seal between the internal tube, the fuel outlet and the casing. The arrangement of the filtering element may be inside the casing and further form a region of unfiltered fuel.

The invention relates to a filter device (1) for filtering liquids, comprising: a filter element (2) having an interior (3) for accommodating a liquid, and a compensating element (5) made of elastically deformable material for accommodating a liquid volume that increases when the liquid freezes. The compensating element (5) is arranged in the interior (3), and a gap (6), in particular an annular gap, for accommodating the liquid is formed between the compensating element (5) and the filter element (3).

The invention relates to a filter device (1) for filtering liquids, comprising: a filter element (2) having an interior (3) for accommodating a liquid, and a compensating element (5) made of elastically deformable material for accommodating a liquid volume that increases when the liquid freezes. The compensating element (5) is arranged in the interior (3), and a gap (6), in particular an annular gap, for accommodating the liquid is formed between the compensating element (5) and the filter element (3).