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4293415 |
Silica chromatographic column
An open tubular or capillary chromatographic column made from drawn silica tubing having an exterior coating for protection from abrasion and moisture and means for holding it in a desired...
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4276061 |
Chromatographic column packing having a bonded organosiloxane coating
Improved packings for columns useful in gas chromatography are made by a multistep process whereby polysiloxane molecules having various organic substituents are chemically bonded to the surface of...
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4274480 |
Gas chromatograph sample conditioner
A sample conditioner for cooling, cleaning and drying hot vaporous samples for subsequent GLC analyses is disclosed. It comprises a heat exchange chamber for cooling such sample to near ambient...
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4228007 |
Chromatographic cartridge and holder
A chromatography cartridge stabilized by radial compression is disclosed with integral distributors each composed of two abutting thin plates, one with generally radial slits and the other with...
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4211658 |
Triaxially compressed packed beds
A cartridge is disclosed which comprises a volume of particulate packing material through which a fluid is to flow, a piece of solid porous material adjacent to the surface of the packing material...
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4209554 |
Polydentate metal salts used in the process for the deactivation of glass surfaces and capillary columns therewith
Phosphonium salts are prepared by reacting polydentate phosphines containing two or more trivalent phosphorus atoms with alkyl or aralkyl halides. Treatment of glass surfaces and glass capillary...
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4208284 |
Apparatus for distribution separation processes
In a process for separating miscible substances by mass transfer between two phases, at least one of which is a fluid phase (gas, vapor or liquid) and the other phase being a solid phase or a...
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4199330 |
Bonded organo-pellicular packings for chromatographic columns
Highly effective chromatographic column packings are prepared by reacting hydroxyl groups on a silica surface with SiCl 4 and then reacting the chlorosilylated surface with a polyglycol or...
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4182678 |
Micro-scale countercurrent chromatograph
A flow-through coil planet centrifuge having a hollow-walled, vertical-axis rotating bowl with a helically-coiled long separation column spirally contained in the hollow wall of the bowl. A...
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4180389 |
Isolation and concentration of sample prior to analysis thereof
A method and apparatus are described for the isolation and purification of a solute prior to carrying the solute by means of a carrier gas into analytical instruments such as gas chromatographs....
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4169790 |
Solid surface texture suitable for a stationary phase for chromatography
A body having a siliceous surface provided with a surface texture comprising predominantly a plurality of siliceous microvilli or whiskers projecting from and grown onto the surface is useful as a...
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4145506 |
Packing materials for gas separation columns
Packing materials for gas chromatography columns are disclosed. The columns can be used to separate polar compounds with low boiling points. The packing materials, which consist mainly of...
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4107041 |
Electromatographic separating apparatus and system
A continuous chromatographic separation is effected by a column packed with finely divided chromatographic particles, the nature of which depends on the materials to be separated. In the case of...
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4101278 |
Ionization detector utilizing tritiated scandium with an acceptable tritium emanation rate at high temperature
An ionization detector, such as an electron capture detector for use in pesticide residue analysis, utilizes a scandium tritide beta particle source. The scandium tritide forms a surface portion of...
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4086051 |
System for preparing packed columns and coated capillary tubes useful in gas chromatography
An integral system contained in a suitable housing which includes means for coating particulate support material with stationary phase chemicals, means for draining liquid from the coated support...
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4070169 |
Chromatographic column oven
In a chromatographic column oven, a particular arrangement of a fan, heater and baffles provides low thermal gradients and rapid oven cool-down. Low thermal gradients are obtained by providing an...
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4063911 |
High temperature polar stationary liquid phase for gas chromatography
This invention is an improved stationary phase utilized in gas-liquid chromatography, having high thermal stability, producing low noise level in an electrical detecting apparatus, comprising of a...
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4054432 |
Polymer lined capillary column and method for producing same
A polymer lined capillary column for use in gas chromotagraphy has a thin layer of ethoxycarbonyl substituted polyphenylene resin solvent deposited and uniformly coated on the interior surface of...
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4043905 |
Chromatographic separation columns with selectively modified active surfaces and methods for their preparations
Selective monomolecular layers on siliceous surfaces used for the construction of high-resolution chromatographic columns are prepared by surface reactions with monohalogenated silanes, silazanes...
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4029583 |
Chromatographic supports and methods and apparatus for preparing the same
Chromatographic supports are disclosed as are methods and apparatus for preparing the same. The support includes an inorganic support matrix that is capable of reacting with silanols, a stationary...
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4003257 |
Analysis of volatile organic compounds
System and method for reproducibly analyzing, both qualitatively and quantitatively, trace amounts of a large number of organic volatiles existing in a gas sample. Applications include (1)...
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3988919 |
Use of graphitized carbon beads for gas liquid chromatography
Carbonized resin microspheroids are used as a column packing in gas-solid chromatography and as a support in gas-liquid chromatography.
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3983299 |
Bonded carbohydrate stationary phases for chromatography
A carbohydrate bonded support for use in a chromatographic system, and a method for preparation of such a support is disclosed herein. An inorganic support has a thin layer of carbohydrate or...
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3960521 |
High temperature polar stationary phase for gas chromatograhy
This invention is an improved stationary phase utilized in gas-liquid chromatograhy, having high thermal stability, producing low noise level in an electrical detecting apparatus, comprising a...
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3922392 |
Process for coating nonporous material with a porous silicon dioxide layer
Nonporous materials are coated with a porous silicon dioxide layer by coating the nonporous material with a polymeric alkoxysiloxane and then subjecting this coating to a hydrolytic...
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3877894 |
Gas chromatograph column material
An improved apparatus and process for gas chromotography using fluorinated graphite as a column-packing material are described.
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3866308 |
Method of making a column for chromatography
A drawn high grade steel tube is prepared for use in a separation column for a chromatograph in that the inner diameter of the tube is enlarged by removing material, either through boring or...
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3839205 |
CHROMATOGRAPHIC ELEMENT AND METHOD FOR PRODUCING THE SAME
A chromatographic element composed of a thin rod of refractory and chemically-stable materials covered with a porous sintered layer of finely divided or powdered glass containing fine particles of...
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3837147 |
DEVICE FOR SEPARATING MIXTURES OF GASEOUS AND/OR VAPOROUS SUBSTANCES ESPECIALLY FOR SEPARATION OF CARRIER GAS IN DEVICES FOR GASCHROMATOGRAPHY
The invention relates to a device for separating mixtures of gaseous and/or vaporous substances which comprises a separating chamber for said mixture provided with an inlet for viscous flow, a...
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3822530 |
CHROMATOGRAPHIC COLUMN PACKING
A chromatographic column packing comprising a polymeric film on a support, the formation of the polymer and its deposition on the support being made in situ.
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3782075 |
COMPLETELY POROUS MICROSPHERES FOR CHROMATOGRAPHIC USES
This invention relates to an improved packing material for chromatographic columns, prepared from a powder of uniform-sized porous microspheres composed of a plurality of interconnected colloidal...
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3771659 |
BOTTOM CONNECTOR AND FILTER HOLDER FOR CHROMOTOGRAPHIC COLUMN
An improved bottom connector and filter holder apparatus for channeling the fluid contained in a chromotographic column in a uniform manner toward the bottom of such column. An apparatus insertable...
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3757490 |
CHROMATOGRAPHIC ADSORBENTS
Improved chromatographic separations are achieved with solid-liquid chromatography by employing particles of a specified particle size distribution, whereby the large to small size particle weight...
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3735570 |
CHROMATOGRAPHIC COLUMN
A chromatographic column is manufactured in the form of a tube having a core of uniform cross-section which contacts the tube wall at two or more points forming separate longitudinal passages in...
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3728845 |
METHOD AND APPARATUS FOR STRIPPING THE COMPONENTS OF A MIXED SAMPLE FROM A TRAP
Method and apparatus for taking out the components of a mixed sample from a trap having a stationary phase therein where the sample components have been separately fixed at different positions. The...
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3727451 |
METHODS OF MAKING AND USING A CHROMATOGRAPHIC COLUMN COMPRISING A FLEXIBLE YARN AS THE SOLID SUPPORT
A chromatographic column is manufactured by passing a guide member such as a needle or wire through a tubing of small diameter. The end of the guide member is secured to a continuous yarn, and the...
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3726405 |
CHROMATOGRAPHIC SHEETS AND FILMS AND ADSORBENT THEREFOR
An adsorbent for a chromatographic sheet or film containing an adsorption active powder and 1 to 50 percent by weight of silicic acid in the form of a silica sol having a content of from 1 to 15...
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3722181 |
CHROMATOGRAPHIC PACKING WITH CHEMICALLY BONDED ORGANIC STATIONARY PHASES
A process for making a chromatographic packing having a polymeric stationary phase in which molecules having the formula wherein R 3 ' is a hydroxyl, or an aliphatic or aromatic hydrocarbon...
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3712028 |
GAS FLOW SWITCHING METHOD AND APPARATUS
A gas flow switch for gas chromatography operates by passing a gas stream through a multi-outlet junction and blocking all but a selected one of the outlet limbs to the stream, at least one outlet...
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3703798 |
RELATING TO THREE-DIMENSIONAL CHROMATOGRAPHIC SYSTEMS
Elution in three-dimensional chromatographic systems is carried out in a direction of increasing cross-section. This is achieved with specially constructed apparatus or with columns modified by...
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3663263 |
METHOD OF PREPARING CHROMATOGRAPHIC COLUMNS
A method of preparing chromatographic columns of the Golay type having substrates of porous polymeric materials which comprises coating the inside surface of a tubular member with a mixture...
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3656277 |
METHOD AND DEVICE FOR GAS CHROMATOGRAPHY
An improved method and device for gas chromatography in which the ill effect of septum-bleeding is eliminated by allowing a small stream of carrier gas to leak out of the top section of the column...
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3638396 |
GAS CHROMATOGRAPH INTERFACING SYSTEM AND METHOD
A gas-analyzing system including in sequence a chromatographic gas separator, a second carrier gas inlet, a carrier gas transfer device and a gas component detector such as a gas density balance,...
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3630006 |
SPIRAL CAPILLARY GAS CHROMATOGRAPHIC COLUMN
A capillary column for a gas chromatograph is presented by mutually cooperable surface portions of the complemental faces of a pair of separable members. At least one of the members has a pair of...
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3581465 |
METHOD AND APPARATUS FOR CONCENTRATING AND TRAPPING SAMPLE COMPONENT
A method and apparatus for separating a mixed sample of gas, fluid or solid into its components trapping each component in its concentrated state in a column having a temperature gradient along the...
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3578757 |
CHROMATOGRAPH FOR DETERMINATION OF ADMIXTURES IN GASES
A chromatograph for the determination of admixtures in gases, comprises a chromatographic column bent in the form of at least a single helix coil or an arc of circle and which is rigidly secured on...
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3547684 |
PROCESS FOR MAKING ORGANIC POLYMER FILLED GAS CHROMATOGRAPHIC COLUMNS
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3531919 |
METHOD OF MANUFACTURING A SEPARATING COLUMN OF A VITREOUS MATERIAL FOR USE IN AN APPARATUS FOR GAS CHROMATOGRAPHY
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3520108 |
METHOD AND APPARATUS FOR CHLORINATED BIPHENYL ANALYSIS
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3514925 |
GAS CHROMATOGRAPHY COLUMN AND METHOD OF MAKING SAME
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