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Searching: chemistry





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Patent # Description
US-5,244,886 11.beta.-phenyl-14.beta.H steroids
New 11.beta.-phenyl-14.beta.H-steroids of general formula (I), where Z is an oxygen atom or the hydroxyimino-grouping N.about.OH, and M and N are either jointly...
US-5,242,538 Reactive ion etch process including hydrogen radicals
The addition of a gaseous source of hydrogen radicals, such as hydrogen, ammonia or methane to oxide RIE etching chemistries, in amounts of from about 5 to about...
US-5,242,522 Photo album page
A method for producing a photo album page composed of superposed panels of transparent polypropylene film joined together by parallel lines of adhesive to define...
US-5,240,654 Method of making ceramic microspheres
A calcined microsphere of ultrafine bauxite particles having a mean particle size in the range 0.01 to 0.3 micrometers, said microsphere having a particle size...
US-5,235,371 Modification of film processor chemistry proportional heating during replenishment
A temperature control system (10) of an automatic film processor (12) includes developer and fixer recirculation paths (30, 40) having thermowell heaters (34,...
US-5,234,838 Ammonia monitor based on ion mobility spectrometry with selective dopant chemistry
An improved ion mobility spectrometer (IMS) and method for operating the same which enables analysis of ammonia in a mixture of gases when air is used as the...
US-5,234,476 Polynitrogen compound having two terminal cycles of the imide type, their preparations and uses
Polynitrogen compound having two terminal cycles of the imide type, its preparation by conventional organic chemistry methods and its use as an additive for...
US-5,232,668 Test strip holding and reading mechanism for a meter
An instrument for analyzing test strips supporting chemistries which react with a medically significant component of a body fluid to indicate the concentration...
US-5,230,785 Method and apparatus for analysis of swimming pool water and analytical cell utilized therein
A swimming pool water analyzer has a housing providing a coulometric titration chamber, a chlorine concentration measuring chamber, a chamber for measuring pH,...
US-5,228,976 Hydrodynamically modulated hull cell
The invention provides, in electroplating quality control methods for manufacturing, better similarity and relevance between a Hull Cell quality control test and...
US-5,227,305 Buffer solution systems for standardizing pH analyzers and electrolytes
A formulation of combined-composition electrolyte and pH buffers for use as standardization solutions in analyzers for clinical chemistry which simultaneously...
US-5,223,492 Derivatives of 19-nor progesterone; process for producing them and the pharmaceutical compositions...
This invention relates to the field of chemistry and more precisely to the field of medicinal Chemistry. It has specifically as subject matter the compounds of...
US-5,223,222 Automatic chemistry analyzer
An automatic chemistry analyzer includes a flow cell mounted so that flow through the cell and tubing connected to the cell is visible from the front of the...
US-5,220,302 NMR clinical chemistry analyzer and method of forming a shield
An NMR clinical chemistry analyzer includes a shield (20) having a plurality of elongate ferromagnetic bars (22) disposed around an NMR magnet (10) and aligned...
US-5,219,485 Materials and methods for etching silicides, polycrystalline silicon and polycides
Gas chemistry and a related RIE mode process is described for etching silicides of the refractory metals titanium, tantalum, tungsten and aluminum and for...
US-5,214,194 Coupler intermediates and their formation
A process for the preparation of 5-substituted 2-aminophenols via nitrones, comprises two reactions. First, a nitrone is reacted with a trihaloacetyl halide to...
US-5,213,762 Automatic chemistry analyzer
An automatic chemistry analyzer includes a flow cell mounted so that flow through the cell and tubing connected to the cell is visible from the front of the...
US-5,210,007 Image intensification chemistry with blocked incorporated developers
A color photographic element for use with a latent or silver image intensification or amplification method which incorporates a blocked color developing agent....
US-5,206,568 Coordinated control of stepper motors
An automated multi-purpose analytical chemistry processing center and laboratory work station having a movable table for supporting microtiter plates and other...
US-5,206,193 High purity fused grain in the system Al.sub.2 O.sub.3 -Cr.sub.2 O.sub.3 -MGO
High purity fused grain and refractory compositions that contain a high purity fused grain made up of 35 to 85 wt. % chromia, 5 to 55 wt. % alumina, and 5 to 45...
US-5,206,187 Method of processing semiconductor wafers using a contact etch stop
A method of processing a semiconductor wafer comprises: a) fabricating a wafer to define a plurality of conductively doped active regions, the active regions...
US-5,204,269 Sample handling for chemistry analyzers
An automatic chemistry analyzer comprises discrete sample cups about the circumference of a carousel. A motor selectively moves the sample cups towards and away...
US-5,201,229 Sensor for controlling water quality of reactor and method of controlling said water chemistry
An element (e.g., a sensor) has a fine-line thin film of a conductor formed on a non-conductive substrate, and a change of physical properties (e.g., ...
US-5,198,540 Process for the preparation of oligonucleotides in solution
Process for the preparation of oligonucleotides by successive linking of individual or several nucleoside and/or nucleotide units in a homogeneous phase system...
US-5,196,510 Molecular recognition units
A system or method for identifying and/or designing novel peptides and polypeptides comprising an amino acid sequence which mimics the molecular recognition site...
US-5,188,941 Enzymatic determination of theophylline
The present invention provides a new methodology and test composition for determining the presence of theophylline in test samples. The methodology employs...
US-5,187,894 Turfing systems for stadia
Stadia and other activity surfaces are provided comprising natural turf. Natural turf units are provided which are transportable between first and second...
US-5,187,134 Formed, polymeric transition-metal complex catalysts with organosiloxane phenylphosphine ligands
This invention relates to formed, polymeric complexes of metals of the eighth subgroup of the periodic system with ligands of an organosiloxane copolycondensate...
US-5,182,083 Sample wheel for chemistry analyzers
An automatic chemistry analyzer includes sample cups circumferentially located on a sample wheel. Means moves the sample cups rotationally under cycloidal action...
US-5,178,730 Paper making
A process for improving art chemistry in papermaking is accomplished by the addition of a cationic polymer and natural hectorite to the furnish prior to headbox....
US-5,177,043 .alpha.-olefin polymerization catalyst component
This invention relates to a catalytic component for the polymerization of .alpha.-olefins and provides a catalytic component of magnesium support type capable of...
US-D332,314 Clinical chemistry analyzer
US-5,175,266 Nucleosides and oligonucleosides with a phosphate-free internucleoside backbone and process for preparing the same
Nucleoside derivatives which contain a nucleo-base, a sugar and an amino acid backbone of the structure: ##STR1## where R' refers to the various amino acid...
US-5,175,133 Ceramic Microspheres
A calcined microsphere of ultrafine bauxite particles having a mean particle size in the range 0.01 to 0.3 micrometers, said microsphere having a particle size...
US-5,174,963 Blood glucose reflectance meter including a null prompting means and a device for providing a constant...
A portable blood glucose monitoring meter that employs an analog circuit in conjunction with a manually rotatable dial that varies the resistance of a ...
US-5,171,491 Method of producing near net shape fused cast refractories
A method of producing near net shape fusion cast refractories. The method includes the steps of continuously introducing refractory particles into a melting...
US-5,168,552 Color separation in ink jet color graphics printing
In liquid-ink color graphics printing, true black ink is preferred over composite black wherever possible, but poor print quality results from printing black ink...
US-5,167,760 Etchback process for tungsten contact/via filling
An etchback process for etching a refractory metal layer formed on a semiconductor substrate with a greatly reduced micro-loading effect. The etch proceeds in...
US-5,165,406 Electrochemical sensor apparatus and method
A sensor assembly for a combination infusion fluid delivery system and blood chemistry analysis system includes a sensor assembly with each of the assembly...
US-5,164,330 Etchback process for tungsten utilizing a NF3/AR chemistry
A process for etching a tungsten layer formed on a semiconductor substrate is described. The etch is carried out in a parallel plate plasma reactor. The etchant...
US-5,160,348 Mixtures of blue azo disperse dyestuffs
Mixtures of dyestuffs of the formulae I to IV ##STR1## wherein the radicals have the meanings customary in dyestuff chemistry, are excellent substitute...
US-5,158,970 Proline derivatives
New proline derivatives of the general formula: ##STR1## wherein R stands for a lower alkyl group and X for a N-terminal protective group conventional in...
US-5,146,413 Method for the determinate evaluation of a chemistry analyzer's combined diluting and analyzing systems
A method for chemistry systems analysis to identify the performance of the functional components of the system, specifically, those of volumes dispensed and...
US-5,143,540 Densification of ceramic-metal composites
Substantially dense, void-free ceramic-metal composites are prepared from components characterized by chemical incompatibility and non-wetting behavior. The...
US-5,141,776 Method of depositing a refractory inorganic coating on the surface of a workpiece
The method relates to inorganic chemistry. Pursuant to the method, a powder mixture comprising a transition metal, a nonmetal, an inert filler and an activator is...
US-5,141,611 Removing and recovering plant polyphenols
Polyphenolic substances such as food dyes, tannins, fruit juices and wine colorings are removed from a solution by adsorption onto a regeneratable adsorbent...
US-5,139,755 Advanced reburning for reduction of NO.sub.x emissions in combustion systems
Techniques for enhancing the burnout zone chemistry for NO.sub.x reduction are disclosed. The key parameters for the enhancement of burnout zone chemistry are:...
US-5,139,744 Automated laboratory work station having module identification means
An automated multi-purpose analytical chemistry processing center and laboratory work station having a movable table for supporting microtiter plates and other...
US-5,139,641 Method of generating a constant derivation potential and a reference electrode in analytical chemistry
In connection with a method for generating a constant derivation potential in analytical chemistry by means of a pH measuring chain containing a reference...
US-5,139,203 Method and device for recovery of scrap goods
Scrap goods (S), for example, electronic and electrical apparatus, components, cables and the like are intermittently and alternately mechanically crushed (1,3),...
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