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4617032 |
Sample modulator cell for gas chromatography
A sample modulator cell for chromatographic analysis uses a diverting valve to send a carrier gas into a duct in a generally closed circular form periodically alternately through two separate...
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4613442 |
Novel optically active polymer, preparation and use
A novel optically active polymer comprising structural elements of the formula: ##STR1## The polymer is applicable for the optical resolution of a racemic mixture through, for instance, column...
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4600696 |
Process and kit for determining blood platelet stress
A process and kit are provided for measuring chemical and physical stresses on the blood platelets of a human patient by measuring reduction in ATP (adenosine triphosphate) and ADP (adenosine...
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4590166 |
Method for separating and measuring the amount of polar compounds and their metabolites in aqueous solutions
This invention relates to a novel method for separating and measuring the amount of polar compounds, such as pyridostigmine, acetylcholine, neostigmine, and edrophonium, and their metabolites in...
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4587834 |
Method and apparatus for analyzing gases dissolved in a liquid sample
Automated gas chromatographic apparatus is utilized to analyze various gases dissolved in the insulating oil of an oil-filled power transformer in an expeditious and reliable manner. A sample of...
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4584276 |
Method for analysis of anions
Method and apparatus for analysis, by ion chromatography, of anions, in a sample solution, wherein accurate analysis of anions in the sample solution is obtained by passing carbonic acid, through a...
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4577492 |
Analytical method and apparatus
A method and apparatus are provided for analysis of a sample of matter for multiple organic constituents and elemental sulfur in a single process. The method involves passage of a fluid sample...
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4576917 |
Method for analysis of additives in polyolefins
A process is provided for the analysis of additives in polyolefins involving dissolving the polyolefin in decalin and subsequently precipitating the polymer, isolating a portion of the extract and...
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4568648 |
***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST***
Reductive electrochemical analysis method with continuous deoxygenation
An improved method for the continuous removal of dissolved oxygen from a flowing liquid containing sample bands, the invention being effective to remove the interference of the dissolved oxygen for...
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4565877 |
Naphthalene derivatives and method for preparation thereof
A naphthalene derivative of the formula: ##STR1## wherein R 1 is hydrogen and R 2 is lower alkyl or phenyl-lower alkyl; or R 1 and R 2 are combined together to form lower alkylene; X is...
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4559063 |
Multi purpose on column injection
The invention relates to a direct on column non-vaporizing injector for gas chromatographic analyses and comprising an accessory device capable of allowing injection with sample vaporization and...
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4555383 |
Electrolytic conductivity detector
A gas chromatograph system is provided with an improved electrolytic conductivity cell (16) for detecting a selected material species in a fluid stream from conventional gas chromatograph (10, 12)...
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4554064 |
Dual working-electrode electrochemical detector for high performance liquid chromatography
A dual working-electrode electrochemical detector includes two working-electrodes disposed in parallel, opposed and closely spaced relationship. The electrodes comprises a low temperature isotropic...
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4554077 |
Method and apparatus for monitoring sewage treatment efficiency and determining sewage sources
A method of tracing sewage effluent is described in which samples of fluid flows are subjected to high performance liquid chromatography with respective elution systems capable of eluting different...
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4552013 |
Electrochemical system
A coulometric flow cell having a defined flow path, and a working electrode in the form of a porous conductive matrix of a selected electro-conductive material in finely divided or powdered form,...
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4552723 |
LC/FTIR System with thermospray solvent separation
Effluent from an LC is passed through a thermospray nozzle which flash vaporizes substantially all of the solvent while directing any sample components as a collimated beam onto a moving tape so...
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4549965 |
Liquid chromatographic method and apparatus with membrane for post-column derivatization
Reagent is added to liquid chromatographic effluent to increase detection sensitivity of sample bands, or to enhance sensitivity with respect to interfering bands which overlap sample bands of...
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4548805 |
Non-invasive test for gastric acid
A non-invasive method for determining gastric acidity in humans, using oral magnesium metal powder while measuring the hydrogen gas response in exhaled breath and belches. The magnesium reacts with...
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4548904 |
Protein sequencing method
A protein sequencing method utilizing a composition of matter which comprises a D-C-B-A reagent wherein A is a moiety which can react with and bind to a terminal amino acid of a protein and can...
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4544485 |
Chromatographic method and means
A novel packing material is provided for liquid chromatographic columns, having a maximum pore size around 80 angstroms, a hydrophobic coating on the inner surfaces adapted to absorb hydrophobic...
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4533518 |
Apparatus for analysis of anions
Method and apparatus for analysis, by ion chromatography, of anions, in a sample solution, wherein accurate analysis of anions in the sample solution is obtained by passing carbonic acid, through a...
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4529521 |
Method and apparatus for analyzing latexes
A method for analyzing the serum phase of a latex solution by permeating low molecular weight components present in the serum phase for a known amount of time through a size selective permeable...
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4511659 |
Liquid chromatograph with electrochemical detector and method
An improved apparatus for electrochemically analyzing a sample in solution is described. The apparatus comprises an electrochemical detector comprising a plurality of electrochemically isolated...
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4507390 |
Chromatographic analysis for anions involving complexing anions with a polyhydric alcohol
Process for analyzing anions in a liquid by means of an ion exchanger and by complex formation with specific anions by addition of polyhydric alcohol. Sensitivity is increased owing to the fact...
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4501817 |
Method for the analysis of materials by chromatography and mass spectrometry
To avoid the problem of instrumental drift encountered when using an open-split interface between a temperature-programmed gas-liquid chromatography column and a mass spectrometer, the inert gas...
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4498774 |
Micro-polarimeter for high performance liquid chromatography
A micro-polarimeter interfaced with a system for high performance liquid chromatography, for quantitatively analyzing micro and trace amounts of optically active organic molecules, particularly...
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4496454 |
Self cleaning electrochemical detector and cell for flowing stream analysis
An improved electrochemical cell and detector which is especially suited for analysis of rapidly changing flowing streams such as found in high performance liquid chromatography is disclosed. A...
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4478941 |
Method for determining component ratios employed to prepare polymers
The ratio of two or more components employed to produce a thermoset or thermoplastic polymer are determined by analyzing the resultant polymer to determine ratio of tracer elements therein which...
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4474889 |
Miniature gas chromatograph apparatus
A gas chromatography assembly has a substrate wafer with grooves and a valve seat etched therein. A plate cooperates with the wafer and the grooves to define gas channels: a carrier gas channel and...
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4472354 |
System for continuously monitoring the ionic content of steam-producing water
An on-line and continuous sampling system for monitoring the ionic content of steam-producing water in a steam-operated electrical power plant. The monitoring system comprises a plurality of...
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4469794 |
Silylation of inorganic oxy-anions
An improved method for analyzing inorganic oxy-anions by silylation with silylating agents of the formulae: ##STR1## wherein R is lower alkyl, Y is hydrogen, lower alkyl or perfluoroloweralkyl and...
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4467038 |
Predetector reservoir for chromatographic analysis instrument
A gas chromatographic apparatus is provided which comprises a gas chromatography column, a detector and an extended conduit between the column and the detector, the conduit providing means for flow...
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4467037 |
Silylation of amino acids
An improved method for analyzing amino acids by silylation with silylating agents of the formulae: ##STR1## wherein R is lower alkyl, Y is hydrogen, lower alkyl or perfluoroloweralkyl and Y 1 is...
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4463096 |
Petroleum source rock identification
The geochemical oil prospecting method is disclosed in which a crude oil sample is analyzed for the presence of distinctive patterns of aromatic sulfur compounds which are indicative of the...
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4459357 |
Process and apparatus for the quantitative determination of cations or anions by ion chromatography
A procedure and an apparatus for the quantitative determination of cations and anions by ion chromatography is described which can be used, for example, to test drinking water, river water or water...
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4448888 |
Compositions and method for correcting temperature dependence of hemoglobin assays
Artificially constituted storage-stable hemoglobin compositions for use in the temperature correction of a cation exchange column chromatographic assay for hemoglobin A 1 or A 1c in a sample of...
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4446105 |
System for analyzing coal liquefaction products
A system for analyzing constituents of coal-derived materials comprises three adsorption columns and a flow-control arrangement which permits separation of both aromatic and polar hydrocarbons by...
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4442217 |
Sample injection
Samples of substances from sources of variable temperature and pressure are injected into a stream of fluid carrier, for example in chromatographic analysis, without bringing them into contact with...
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4429736 |
Concentration in time of a gas component entrained in a carrier gas
The combination of an electrically conductive hollow body, a step-down transformer operable at a frequency greatly in excess of 1 kHz and solid phase temperature depressing means is used to realize...
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4426452 |
Volatile metal carbonyl analysis
The presence of volatile metal carbonyls, e.g., nickel tetracarbonyl and iron pentacarbonyl, in fluid streams can be measured simultaneously by a gas chromatograph using squalane as the stationary...
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4404065 |
Electrochemical detection system and method of analysis
An electrochemical detection apparatus is provided. The apparatus comprises a flow-cell having at least one active testing electrode, at least one reference electrode, and at least one counter...
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4391778 |
Method and apparatus for the analysis of materials by chromatography and mass spectrometry
To avoid the problem of instrumental drift encountered when using an open-split interface between a temperature-programmed gas-liquid chromatography column and a mass spectrometer, the inert gas...
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4388408 |
Coker feedstock analysis method
A clarified slurry oil coker feedstock is subjected to absorption chromatography and ultraviolet light adsorptivity and the results are correlated to determine the suitability of the feedstock for...
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4359323 |
Single pump liquid chromatograph analytical system for amines
This application discloses a liquid chromatography system which can be operated in a batch or a continuous mode. The system consists of the chromatographic column, a reaction column wherein the...
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4352884 |
Carrier having acrylate copolymer coating for immobilization of bioactive materials
Carriers coated with a copolymer of a hydrophilic acrylate or methacrylate monomer and a copolymerizable unsaturated carboxylic acid or unsaturated amine are provided which are substantially free...
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4347215 |
Device for the automation of at least one operation in an injector for gas chromatographic columns
A device is disclosed for coordinating the position of an injection syringe needle in a gas chromatographic apparatus with at least one other operation of the gas chromatographic apparatus...
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4341634 |
Analytical method of hydrocarbon compounds
A high speed liquid chromatography to separate hydrocarbon compounds contained in a solution into three components, namely, saturates, unsaturates and aromatics, an analytical method of...
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4334540 |
Method of diagnosing periodontal disease through the detection of pyridine compounds
A novel method of diagnosing periodontal disease is disclosed wherein telltale pyridine and alkyl-pyridine compounds which are detected in the oral cavity are indicative of periodontal disease. An...
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4305906 |
Apparatus for analyzing oxygen, nitrogen and hydrogen contained in metals
An apparatus for analyzing oxygen, nitrogen and hydrogen which are contained in metals. The apparatus includes a graphite crucible which has a sample therein and which is heated to generate a...
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4298472 |
Process for manufacturing impregnated silicas and the use of these silicas for analysis or purification of industrial products
Impregnated silica is manufactured by passing a substantially anhydrous solution of a polar organic compound in a non-polar organic diluent through a bed of substantially anhydrous silica...
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