Abstract: Disclosed herein are apparatus and methods for mitigating column bed compression over time. This invention provides for an improved column design and method of controlling bed density in a chromatographic column using a protruding portion of a filter assembly. The invention results in a higher sorbent bed density than can normally be achieved using a fixed length column of conventional design. The invention may be implemented as a unique filter assembly or as a column tailored for the application and a matching filter assembly.

Abstract: A solid phase extraction (SPE) device having a reservoir with an opening; a well comprising an internally tapered wall, the well having a wider interior diameter at an end closest to the opening than at an exit spout; a first filter within the well; a bed of sorbent particles within the well below the first filter; and a second filter having a diameter smaller than the first filter within the well below the bed of sorbent particles and above the exit spout is provided. A method of performing SPE using the device is also provided.

Abstract: A solid phase extraction (SPE) device having a reservoir with an opening; a well comprising an internally tapered wall, the well having a wider interior diameter at an end closest to the opening than at an exit spout; a first filter within the well; a bed of sorbent particles within the well below the first filter; and a second filter having a diameter smaller than the first filter within the well below the bed of sorbent particles and above the exit spout is provided. A method of performing SPE using the device is also provided.

Abstract: A solid phase extraction (SPE) device having a reservoir with an opening; a well comprising an internally tapered wall, the well having a wider interior diameter at an end closest to the opening than at an exit spout; a first filter within the well; a bed of sorbent particles within the well below the first filter; and a second filter having a diameter smaller than the first filter within the well below the bed of sorbent particles and above the exit spout is provided. A method of performing SPE using the device is also provided.

Abstract: Disclosed herein are apparatus and methods for mitigating column bed compression over time. This invention provides for an improved column design and method of controlling bed density in a chromatographic column using a protruding portion of a filter assembly. The invention results in a higher sorbent bed density than can normally be achieved using a fixed length column of conventional design. The invention may be implemented as a unique filter assembly or as a column tailored for the application and a matching filter assembly.

Abstract: A device for storing, measuring and dispensing granular and powder material has a container for accommodating a material, a dispensing unit with a casing having a filling opening and a dispensing opening and a slight movable in the casing between the filling position in which a slight compartment can side with the filling opening for pouring the material from the container into the slide, a spring, and a spring moving the slide from the filling position to a dispensing position in which the dispensing opening coincides with the filling opening of the casing and a spring arranged so that the slide can be moved from the filling position to the dispensing position by a user with overcoming a spring force, while the spring moves the slide from dispersing position to the stirring position.

Abstract: A device for storing, measuring and dispensing granular and powder materials has a container for accommodating a material, and a dispensing unit connected to the container, the dispensing unit including a casing provided with a filling opening communicating with an interior of the container and a dispensing opening which is spaced from the filling opening and formed to dispense a material, a slide movable in a passage of the casing and having a slide compartment formed so that when the slide is moved in the passage to a filling position the slide compartment coincides with the filling opening and when the slide is moved to a dispensing position the slide compartment coincides with the dispensing opening so that the material can be poured from the container through the filling opening into the slide compartment in the filling position and dispensed from the slide compartment in the dispensing position, and a spring provided between the casing and the slide so that the slide is moved from the filling position t

Abstract: A solid phase extraction (SPE) device having a reservoir with an opening; a well comprising an internally tapered wall, the well having a wider interior diameter at an end closest to the opening than at an exit spout; a first filter within the well; a bed of sorbent particles within the well below the first filter; and a second filter having a diameter smaller than the first filter within the well below the bed of sorbent particles and above the exit spout is provided. A method of performing SPE using the device is also provided.

Abstract: A solid phase extraction (SPE) device having a reservoir with an opening; a well comprising an internally tapered wall, the well having a wider interior diameter at an end closest to the opening than at an exit spout; a first filter within the well; a bed of sorbent particles within the well below the first filter, and a second filter having a diameter smaller than the first filter within the well below the bed of sorbent particles and above the exit spout is provided. A method of performing SPE using the device is also provided.

Abstract: An embodiment of the present invention features a chromatographic device. The chromatographic device comprises a body having a cylindrical wall having an exterior diameter. The cylindrical wall is flexible, expanding and contracting in response to radial pressure. The cylindrical wall defines a cavity for holding a chromatographic media. A chromatographic media is retained within said cavity. A spring element surrounds the cylindrical wall, permanently radially compressing said cylindrical wall and opposing the expansion of the wall in response to internal pressure within the cavity. The radial compression prevents the movement of the chromatographic media in the cavity and the opening of channels about the walls of the body.

Abstract: A solid phase extraction (SPE) device having a reservoir with an opening; a well comprising an internally tapered wall, the wall having a wider interior diameter at an end closest to the opening than at an exit spout; a first filter placed within the well; a bed of sorbent particles placed within the well below the first filter; and a second filter having a diameter smaller than the first filter placed within the well below the bed of sorbent particles and above the exit spout is provided. A method of performing SPE using the device is also provided.

Abstract: A chromatography column with filters having minimal volume. A stamped screen disk is coated with fluorocarbon polymer on both sides, leaving a center area open. The fluorocarbon polymer coating serves as a gasket, providing reliable sealing for pressure up to approximately 10000 psi. The chromatography column comprises a fitting having an internal cavity. A fluorocarbon polymer coated screen is placed within the cavity. A threaded capillary tubing is screwed inside the cavity. At the end of the capillary lies a compression screw solvent tubing connection.

Abstract: A permanently radially compressed chromatographic column having a flexible-walled encasement containing chromatographic media, and a wound element surrounding the encasement for radially compressing the column.

Abstract: An embodiment of the present invention features a chromatographic device. The chromatographic device comprises a body having a cylindrical wall having an exterior diameter. The cylindrical wall is flexible, expanding and contracting in response to radial pressure. The cylindrical wall defines a cavity for holding a chromatographic media. A chromatographic media is retained within said cavity. A spring element surrounds the cylindrical wall, permanently radially compressing said cylindrical wall and opposing the expansion of the wall in response to internal pressure within the cavity. The radial compression prevents the movement of the chromatographic media in the cavity and the opening of channels about the walls of the body.

Abstract: A chromatography column is disclosed. The large diameter chromatography column comprises a column body with threaded end portions. At each of the end portions, a respective filter housing is disposed. A respective threaded end cap is threaded onto each of the threaded end portions. Each of the end caps has holes for receiving a plurality of mechanical fasteners. The mechanical fasteners are installed into each end cap and apply pressure against the filter housing which forces the filter housing against the face of the column, thus sealing it. When the need to open the column arises, the mechanical fasteners can be easily loosened to release the tension on the thread between column body and end cap. After this, the end cap can be unscrewed with minimal torque.

Abstract: An embodiment of the present invention features a chromatographic device. The chromatographic device comprises a body having a cylindrical wall having an exterior diameter. The cylindrical wall is flexible, expanding and contracting in response to radial pressure. The cylindrical wall defines a cavity for holding a chromatographic media. A chromatographic media is retained within said cavity. A spring element surrounds the cylindrical wall, permanently radially compressing said cylindrical wall and opposing the expansion of the wall in response to internal pressure within the cavity. The radial compression prevents the movement of the chromatographic media in the cavity and the opening of channels about the walls of the body.

Abstract: A permanently radially compressed chromatographic column having a flexible-walled encasement containing chromatographic media, and a wound element surrounding the encasement for radially compressing the column.

Abstract: A device for individual collection of contaminated objects has a substantially elongated element having a first hollow portion formed to receive a user's palm and provided with a projection for receiving a user's thumb, and a second portion extending from the first portion and having an inlet opening for insertion of the user's arm, the second portion having a width which is at least greater than a width of the first portion, so that when a user by manipulations with the first portion and the projection collects the objects, the second portion can be turned over the first portion and farther so that the element is turned inside out to produce a bag-like structure with contaminated objects inside, and a unit for closing the element after it has been converted inside out, the closing a unit being a strap formed as a rear part of the second portion which is formed of one piece with a remaining part of the second portion and includes a plurality of transverse and longitudinal cuts, the rear part in an inoperative

Abstract: A device for individual collection of pet excrements has a substantially elongated element having a first hollow portion formed to receive a user's palm and provided with a projection for receiving a user's thumb, and a second portion extending from the first portion and having an inlet opening for insertion of the user's arm, the second portion having a length which is at least equal to a length of the first portion, and a width which is at least equal to the width of the first portion, so that when a user by manipulations with the first portion and the projection collects the pet excrements, the second portion can be turned over the first portion and farther so that the element is turned inside out to produce a bag-like structure with excrements inside.