Metal working – Method of mechanical manufacture – Multiperforated metal article making
Patent
1995-04-10
1997-02-18
Echols, P. W.
Metal working
Method of mechanical manufacture
Multiperforated metal article making
210266, 422 70, B23P 1516
Patent
active
056031602
ABSTRACT:
An extraction cartridge, for extracting a component from a composition, contains a packing composition including a buffer composition, diatomaceous earth and absorbent. The cartridge is made by heating each component to assure it is free from contaminants. The diatomaceous earth is sifted to obtain a particular particle size. The cartridge also includes frits and filters for holding the packing composition within the cartridge. All of the components of the cartridge are selected or processed to assure that no contaminants are leached into the sample being extracted. A processing system automatically processes a plurality of cartridges. The processing system, which is capable of continuous operation, includes a platform, a rack for holding the cartridges, sample vials and extraction tubes. A walking beam conveyor system moves the rack along the platform and a system of robotic arms automatically transfers the sample to be extracted from the sample vial to the extraction cartridge and adds a predetermined amount of solvent into the extraction cartridge. The extraction process includes adding a sample into the extraction cartridge, waiting a predetermined time, adding a predetermined amount of solvent and collecting the solvent in a collection tube. The processing system can be controlled by a computer system including a dual microprocessor.
REFERENCES:
patent: 5084168 (1992-01-01), Woog
Partial European Search Report filed on Jun. 29, 1995.
Journal of Pharmaceutical 7 Biomedical Analysis, vol. 11, No. 4/5, 1993, Permagon Press, GB, pp. 277-284, M. Casas et al., "Solid-Phase extraction of 1,4-benzodiazepines from Biological Fluids".
Journal of Pharmaceutical 7 Biomedical Analysis, vol. 10, No. 1992, Pergamon Press, GB, pp. 937-942, Hubert P. Chiap et al. "Determination of Varapamil and Noverapamil in Human Plasma by Liquid-Chromatography--parison Between a Liquid-Liquid-Extraction Procedure and an Automated Liquid Solid Extraction Method for Sample Preparation".
Therapeutic Drug Monitoring, vol. 13, No. 2, 1991, ISSN 0163-4356, pp. 157-165, Verbesselt R., "High-Performance Liquid-Chromatographic Determination of 12 Antiarrhythmic drugs in Plasma Using Solid-Phase Column Extraction".
Burrows John H.
Lessard Denis
Echols P. W.
Phoenix International Life Sciences Inc.
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