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| Number | Title | Issue Date |
| 5594547 | Multielement atomic absorption spectrometer and measurement method using such an atomic absorption spectrometer The invention relates to a multielement atomic absorption spectrometer for simultaneously performing measurements for determining both one element and a plurality of elements under optimum conditions. The atomic absorption spectrometer comprises at least ... | 01/14/1997 |
| 5527510 | In situ PCR amplification system A complete in situ PCR system for amplification of nucleic acids contained in a prepared cell or tissue sample. The containment system for the PCR sample comprises a glass microscope slide, a specimen sample containing the target nucleic acid sequence mou... | 06/18/1996 |
| 5495331 | Dual-beam polychromator The present invention refers to a dual-beam polychromator comprising a reflecting dispersion grating, a first entrance slit for a first ray bundle, a second entrance slit for a second ray bundle and first and second detector devices respectively used for ... | 02/27/1996 |
| 5475202 | Method and apparatus for heating a thermionic detector source The bead source for the thermionic detector of a gas chromatograph is heated by the secondary winding of a transformer having a center-tapped primary and operating in the push-pull configuration. The voltage drop across the bead is compared with a presele... | 12/12/1995 |
| 5464157 | Nebulizer for use in an atomic absorption system The present invention is directed to a nebulizer for use in an atomic absorption system which includes a capillary assembly having a capillary holder having an internal axial passage therethrough, a sapphire capillary tip mounted on one end of the capilla... | 11/07/1995 |
| 5456360 | Holder assembly for reaction tubes This invention is directed to a plastic holder assembly for loosely holding a plurality of microtiter sample tubes, which includes a tray having a plurality of holes for receiving the tubes and having opposite vertical end walls, each of which have two sp... | 10/10/1995 |
| 5450196 | Time-resolved Fourier-transform optical spectroscopy utilizing in-phase and quadrature cyclic perturbation data values In FT-DIRLD (Dynamic Infra Red Linear Dichroism) apparatus partly represented in FIG. 1, units 100-105, responding to interferometer output IB (indicated elsewhere), cause unit 106 to yield an interferogram combining static and dynamic dichroism interfero... | 09/12/1995 |
| 5448351 | Echelle polychromator An Echelle polychromator 50 has disposed upstream thereof a pre-monochromator 14 comprising a prism 20. The linear dispersion of the pre-monochromator 14 is variable by varying the angular dispersion of the prism 20. A particular spectral position and the... | 09/05/1995 |
| 5412468 | Grouping of spectral bands for data acquisition in a spectrophotometer Spectral bands are grouped for data acquisition in a spectrophotometer with a charge-coupled detector having a plurality of pixels. Preliminary data is generated on time-integrated radiation to the pixels for a sample. Maximum permitted exposure times for... | 05/02/1995 |
| 5364790 | In situ PCR amplification system A complete in situ PCR system for amplification of nucleic acids contained in a prepared cell or tissue sample. The containment system for the PCR sample comprises a glass microscope slide, a specimen sample containing the target nucleic acid sequence mou... | 11/15/1994 |
| 5317378 | Enhancing emission of excited radiation in an analytical sample subjected to exciting radiation A spherical sample cell (FIG. 4A) bears an external inwardly specular laye defining a hollow imaging mirror 11D and an optical aperture 11E. The mirror acts as an integrator of both the exciting radiation for irradiating the sample and the resulting excit... | 05/31/1994 |
| 5315528 | Method of, and apparatus for, absorbance correction in atomic absorption spectroscopy In order to provide a linear calibration graph when analysing samples by atomic absorption spectroscopy, a maximum absorbance value is determined conventionally for a given analyte. The individual absorbance values of a sample containing an unknown amount... | 05/24/1994 |
| 5314664 | Sample supply system having integrated microwave disintegration The flow-injection system includes a microwave oven having a flow-through reactor having a flow-through conduit located in windings around a conduit carrier for absorbing microwaves. The windings extend through the radiation cavity of the microwave oven o... | 05/24/1994 |
| 5271230 | Liquid gas temperature control apparatus for and methods of depressing temperature to and maintaining it at a chosen depressed value Apparatus and methods are disclosed for lowering the temperature within a chamber from a higher actual value to a set desired lower value, the latter being stabilized by intermittently flowing liquid gas selectively through the chamber and a venting orifi... | 12/21/1993 |
| 5247841 | Apparatus for producing sample vapor for transferral into an inductively coupled plasma A graphite tube for electrothermal vaporization of a sample to be investigated is held between annular contacts through which a flow can be passed lengthwise through the graphite tube. The contacts surround the graphite tube in a shell-like manner; a prot... | 09/28/1993 |
| 5218553 | Method for determining concentrations by means of atomic emission spectroscopy A method for determining concentrations by means of atomic emission spectroscopy which contains the method steps: (a) generating an atomic emission with a known concentration of a looked-for element, (b) scanning the obtained emission spectrum by means of... | 06/08/1993 |
| 5194914 | Furnace for the electrothermal atomization of samples in atomic absorption spectroscopy A tubular furnace having an inner body connecting by an integral radially extending web. The web is positioned on the side of the tubular furnace so that a sample placed in the inner body and resting in the bottom thereof will not be heated by the web. Ot... | 03/16/1993 |
| 5194226 | Dosing device for analyzing apparatus In a dosing device for analyzing apparatus, particulary for liquid chromatography, with a dosing loop, a change-over valve and a dosing needle (20) which can be introduced into a sample inlet (56) of the change-over valve (24), through which dosing needle... | 03/16/1993 |
| 5181077 | Atomic absorption spectrometer An atomic absorption spectrometer contains a line-emitting first light source (16), an official system (20, 22, 28, 30, 34) for generating a measuring light beam (18) which passes through a test sample space (12) and impinges on a photoelectric detector (... | 01/19/1993 |
| 5171530 | Vial locator and sensor An analytical instrument sample vial positioning and sensor device. A radius or cone-shaped body portion extending below a surface contacts a loosely held sample vial having a flexible septum thereon. The shaped body portion is biased downward resulting i... | 12/15/1992 |
| 5098658 | Device for analyzing samples for mercury and/or hydride-forming elements In a device for analyzing samples for mercury and/or hydride-forming elements by means of atomic absorption spectroscopy, a first arrangement for determining the mercury according to the amalgam method comprising passage throttling means in the form of a ... | 03/24/1992 |
| 5087123 | Atomic emission spectrometer with background compensation A method of and a device for multi-element measurement of elements in a sample with correction for background emission. The method starts with atomizing a sample and then exciting the transformed atoms to emit light containing characteristic spectral line... | 02/11/1992 |
| 4881814 | Scanning Michelson interferometer assembly The invention is directed to a scanning Michelson type interferometer assembly which includes a beam splitter assembly for receiving a beam of radiation from a source, a stationary plane mirror for receiving and returning a first subbeam over a fixed opti... | 11/21/1989 |
| 4876005 | High pressure column assembly for a liquid chromatograph system Liquid chromatography column coupling assembly having a column enclosed in a housing member to form a column cartridge and including coupling assemblies at respective ends of the cartridge, each comprising a coupler member and a collar member. The coupler... | 10/24/1989 |
| 4868573 | Line frequency slaved voltage-to-frequency converter system The system includes a synchronous voltage-to-frequency converter connected to receive an analog input signal voltage and to generate a train of output pulses. A counter is connected to receive and count the output pulses and a digital register is connecte... | 09/19/1989 |
| 4856319 | Thermally switchable katharometer A gas chromatography system having a chromatography column, a detector for analyzing sample components with a detection chamber connected to the column outlet, and a switching assembly for selectively alternately filling the detector chamber with carrier ... | 08/15/1989 |
| 4857721 | Optical direction sensor having gray code mask spaced from a plurality of interdigitated detectors Apparatus for detecting and determining the direction of arrival of optical radiation. The apparatus includes a first mask having one or more slit apertures, a binary encoding mask which combines the functions of angle sensing and digitizing using a so-ca... | 08/15/1989 |
| 4848921 | Apparatus and method for power compensation in a differential scanning calorimeter Apparatus and methods are disclosed for performing power compensation in a differential scanning calorimeter. The device operates by first subjecting only a reference material, in a single furnace, to a predetermined, variable, temperature program supplie... | 07/18/1989 |
| 4846626 | Wafer handling system Apparatus is set forth for prealigning the transport stage of an automated wafer handling lithographic system. The wafer is first rotated and its displacement in X, Y, and .THETA. from a desired orientation is determined. Rotation of the wafer is stopped ... | 07/11/1989 |
| 4837441 | Ionization detectors for gas chromatography An ionization detector for gas chromatography employs as an electron source a film (66) of gold deposited on an ultra-violet lamp (64) within a cylindrical glass body (60) closed at the ends by PTFE plugs (62 and 68). A jet anode (72) receiving effluent f... | 06/06/1989 |
| 4837443 | Guard ring for a differentially pumped seal apparatus Disclosed is a guard ring (20) in a particle beam lithography system (10) of a pressurized gas surrounding a seal apparatus (14) and concentric therewith so that the guard ring (20) of gas is located between the seal apparatus (14) and ambient pressure in... | 06/06/1989 |
| 4834536 | Electrical contacts for supplying heating current to an electrothermal atomizer Electrical contact members 20, 22 for supplying transverse electrical current to a tubular furnace member (22) for electrothermal atomization of samples for analysis by atomic absorption spectrophotometry, the tubular furnace member having diametrically o... | 05/30/1989 |
| 4831640 | Illumination system for x-ray lithography This invention is directed to an improvement in an x-ray lithography system having an x-ray point source of radiation, a wafer disposed in spaced relationship with respect to the source, and a mask disposed between the source and the wafer whereby radiati... | 05/16/1989 |
| 4818489 | Device for sampling breath air at the workplace A pocket instrument for sampling breath air in situ, includes a microprocessor-controlled directional control valve with needles at an outlet to which needle the sample vessels are attached. The directional control valve is arranged to be connected throug... | 04/04/1989 |
| 4818838 | Apparatus for preselecting and maintaining a fixed gap between a workpiece and a vacuum seal apparatus in particle beam lithography systems Disclosed is a particle beam lithography system (10) having a workpiece loading/unloading position to one side of a particle beam (32) and beam column (12) where a workpiece (14), to be processed, is placed in a vacuum chuck (100) to eliminate any irregul... | 04/04/1989 |
| 4816123 | Method of fabricating capillary electrophoresis separation channels The basic concept of this invention involves the use of a wire or capillary tube as a template strand. The outside diameter and shape of the template strand correspond to the inside diameter and shape of a desired separation capillary. A detector may be i... | 03/28/1989 |
| 4813267 | Thermal conductivity detector A thermal conductivity cell is described whose elements are well protected against short term temperature fluctuations, changes in flow rates, leaks, and vapor pressures of construction materials. The sample and reference chambers are formed within a rela... | 03/21/1989 |
| 4810884 | Apparatus and method to distinguish between oil and gas combustion by remote observation using an infrared spectrometer An apparatus and method for detecting and analyzing the emissions or effluents from gas or oil combustion so as to discriminate between them. A spectrometer detects the spectra of a combustion effluent or exhaust. Identifying features of carbon dioxide an... | 03/07/1989 |
| 4810621 | Contact lithographic fabrication of patterns on large optics An apparatus and method for the generation of patterns on large optics. A coating layer is deposited on the surface of a large substrate, whereupon a photoresist layer is deposited on the coating layer in relatively small localized areas. A flexible mask ... | 03/07/1989 |
| 4806747 | Optical direction of arrival sensor with cylindrical lens An improved optical direction of arrival sensor in which incoming radiation passes through a cylindrical lens placed through a top mask and is focused in the gap between the lens and a detector array concentric about the back of the lens. The focal line t... | 02/21/1989 |
