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Searching: chemistry





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Patent # Description
US-4,712,561 Neuroreceptor activity assessment
The effectiveness of drugs and substances that affect brain chemistry can be efficiently and relatively inexpensively monitored. Radioactive tracer substances...
US-4,708,928 Photothermographic element comprising particles each containing silver halide, a silver compound and reducing agent
Photothermographic imaging chemistry, and particularly color chemistry, can be contained within solid particles. Photothermographic media can then be made by...
US-4,705,841 TBEA linked epoxy-urethanes
Novel epoxy-urethane resins are produced by the reaction of a urethane-alkanolamine adduct with an epoxy resin. The urethane-alkanolamine adduct is prepared by...
US-4,702,879 Nuclear reactor with passive safety system
A pressurized nuclear water reactor has a substantially cylindrical flow liner with a cylindrical wall section and bottom and an open top. A barrel forms a riser...
US-4,695,633 Chromogenic 4,4-diaryl-dihydroquinazolones, their preparation and their use
Chromogenic 4,4-diaryl-dihydroquinazolones of the formula ##STR1## wherein X.sup.1, X.sup.2 and X.sup.3 independently of one another represent hydrogen,...
US-4,693,863 Process and apparatus to simultaneously consolidate and reduce metal powders
A powder metallurgy consolidation process and apparatus for carrying out said process produces integral metal bodies by heating metal powder of a predetermined...
US-4,692,346 Method and apparatus for controlling the surface chemistry on objects plated in an electroless plating bath
A method and apparatus for controlling surface chemistry on objects plated in an electroless plating bath. Cyclic voltammetry measurements are made for different...
US-4,687,778 Anti-amnestic agent
An anti-amnestic agent which comprises as an active ingredient thereof at least one prolinal derivative of the general formula: ##STR1## wherein A is a...
US-4,683,207 Culture monitoring system
A system for continuously monitoring the chemistry of a liquid medium within a container includes assaying instrumentation located exteriorly of the container, a...
US-4,681,828 Method of chemical electrographic image amplification using chemically active toner particles
A method of forming an image is disclosed in which chemically active toner particles are used to trigger image amplification chemistry after their attraction to...
US-4,681,436 Femtosecond laser pulse measuring system
A system for measuring laser pulse durations in the range of ten nanoseconds to one femtosecond to an accuracy of one femtosecond, includes a primary pulse...
US-4,680,408 Acyl derivatives
There are presented compounds of the formula ##STR1## wherein R.sup.1 is one of the 3-substituents usable in cephalosporin chemistry, R.sup.2 is hydrogen,...
US-4,680,086 Dry etching of multi-layer structures
A method for etching multi-layer structures particularly suited for patterning refractory metal silicide/polysilicon sandwiches. A first dry etch process is...
US-4,678,754 Liquid clinical control standard, and reagent products
This invention relates to the field of clinical controls useful for calibrating clinical chemistry analyzers and in manual testing methods, as well as clinical...
US-4,678,331 Multicuvette rotor assembly
An improved analytical cuvette rotor assembly for use in a centrifugal chemistry analyzer comprising a disc-shaped body having a plurality of radially extending...
US-D290,650 Probe for aspirating and dispensing sample fluid in a clinical chemistry analyzer
US-4,670,551 Epoxy steroids
7.alpha.-acylthio-9.alpha.,11.alpha.-epoxy-20-spirox-4-ene-3,21-diones of the formula I ##STR1## in which R represents lower alkanoyl and --A--A--...
US-4,669,878 Automatic monochromator-testing system
An automated chemistry-testing system for analyzing serum samples in which a controlled intensity, monochromatic light beam of substantially any desired...
US-4,665,016 Chromogenic compounds, a process for their preparation and their use
Chromogenic compounds of the formula I ##STR1## and a process for their preparation are described, X denoting a hydrogen atom, a protective group...
US-4,659,426 Plasma etching of refractory metals and their silicides
Refractory metals, refractory metal silicide, and polysilicon/refractory metal silicide sandwich structures integrated circuits are etched using carbonyl...
US-4,654,127 Self-calibrating single-use sensing device for clinical chemistry and method of use
A single-use sensing device for a clinical chemistry analyzer system includes a carrier which supports a capillary passage. Species selective sensors are located...
US-4,654,112 Oxide etch
A new process for plasma etching silicon oxides in integrated circuit structures. A chemistry comprising both oxygen and nitrogen trifluoride is used, with...
US-4,652,130 Method of and arrangement for an interferometer
In the inventive interferometers, based on the principle of Michelson, an teration of pathlength is obtained through rotation of a movable mirror, where this...
US-4,650,867 Process for the preparation of 2,4,6-tris(aminophenylamino)triazines
A process for the preparation of 2,4,6-tris(aminophenylamino)triazines by condensing s-trichlorotriazine with 3 equivalents of a partially protected ...
US-4,645,861 3-sulfonylamino-4-amino phenyl acyl derivatives
A 4-acyl-o-phenylenediamine is selectively sulfonated on the amino group meta to the acyl group to provide an important intermediate for benzimidazole...
US-D288,478 Clinical chemistry analyzer
US-4,643,976 Liquid clinical control, standard, and reagent products
This invention relates to the field of clinical controls useful for calibrating clinical chemistry analyzers and in manual testing methods, as well as clinical...
US-4,642,047 Method and apparatus for flame generation and utilization of the combustion products for heating, melting and...
Method and apparatus for high temperature heating, melting, refining and superheating of materials, such a steel scrap, metals, ceramics or glass. The invention...
US-4,640,919 3-substituted carbacepem compounds having antibacterial effect
Carbacephem compounds represented by the formula: ##STR1## [wherein R.sub.1 is a lower alkylsulfonyloxy, unsubstituted or substituted arylsulfonyloxy,...
US-4,637,403 Glucose medical monitoring system
Hand-held shirt-pocket portable medical diagnostic system for checking measurement of blood glucose, urea nitrogen, hemoglobin, blood components or other body...
US-4,627,445 Glucose medical monitoring system
Hand-held shirt-pocket portable medical diagnostic system for checking measurement of blood glucose, urea nitrogen, hemoglobin, blood components or other body...
US-4,622,007 Variable heat generating method and apparatus
Method and apparatus for high temperature heating, melting, refining and superheating of materials, such as steel scrap, metals, ceramics or glass. The invention...
US-4,621,072 Process for preparing abrasion-resistant coated catalysts
A process is disclosed for preparing coated catalysts, inter alia, for gas phase oxidations in organic chemistry, comprised of an inert support and a coating of...
US-4,619,749 System for extracting silver from liquid solutions
Ionic silver is extracted from photographic fixing solutions by electrolytic plating on a removably fixed cathode plate of an electrode assembly connected in...
US-4,616,779 Process and device for injecting a finely divided material into a hot gaseous flow and apparatus for carrying...
The invention relates to a process and device for injecting at least one stream of a finely divided material into a hot gaseous flow, such as a plasma jet....
US-4,615,866 Fluid-sampling system and method
Fluid-sampling system and method for automated, chemistry-analyzing apparatus for withdrawing precise quantities of serum samples from a specimen container and...
US-4,615,511 Continuous steelmaking and casting
In a continuous steelmaking method, a molten metal bath is maintained within a rotary furnace heated by oxy-fuel burners at the charge and discharge ends....
US-4,609,541 Method of processing coal gas
An improved method for the recovery of elemental sulfur(S) from a coal-gas containing hydrogen sulfide (H.sub.2 S) wherein hot lime (CaO) is used and then...
US-4,609,400 Method and apparatus for preheating charge materials for continuous steelmaking
A method and apparatus for the continuous preheating of charge materials for an electric steelmaking furnace operation including provision for preheating with...
US-4,607,028 Novel carboxylic acid esters
Novel 17.beta.-methoxycarbonyl derivatives of the androstane series of the formula ##STR1## in which R represents alkyl having from 1 to 4 carbon atoms are ...
US-4,606,227 Apparatus and method for simulating diagenesis
An apparatus and method for simulating diagenetic models, comprising passing a fluid from a fluid supply vessel sequentially through two rock sample containment...
US-4,604,460 1-oxadethiacepham compounds
Intermediates for preparaing an antibacterial 1-dethia-1-oxacephalosporins which are represented by the following formula: ##STR1## wherein R is a...
US-4,603,120 Cyclic octapeptides and pharmaceutical preparations thereof, as well as processes for their manufacture, and...
Cyclic octapeptides of the formula ##STR1## in which Aaa represents a radical of a straight-chained .alpha.,.omega.-diaminoalkanoic acid having from 4 to 7...
US-4,602,483 Coal slurry system
A slurry of liquified gas such as carbon dioxide and finely pulverized coal particles is provided in a mixing chamber and discharged from the chamber into a...
US-4,600,427 Method of ladle steelmaking and product produced thereby
A method of refining steel in the ladle using a low melting point slag is disclosed. Both ELS and resulfurized steels are subjected to the simultaneous effect of...
US-4,598,049 General purpose gene synthesizer
A microprocessor controlled, general purpose gene synthesizer for programmably synthesizing selected nucleotide sequences. Depending upon a programmed chemistry,...
US-4,593,093 Acyl derivatives
There are presented compounds of the formula ##STR1## wherein R.sup.1 is one of the 3-substituents usable in cephalosporin chemistry, R.sup.2 is hydrogen,...
US-4,593,018 Oligopeptide aldehydes useful as specific inhibitors of enterokinase
Compounds of the general formula: ##STR1## wherein n is an integer from 2 to 6, m is an integer from 2 to 4, p is an integer from 1 to 3, R is H, an amino...
US-4,588,810 Basic triphendioxazine dyestuffs
Basic triphendioxazine dyestuffs of the formula ##STR1## wherein R.sub.1 and R.sub.2, independently of each other, each denote hydrogen, halogen, alkyl,...
US-4,585,646 Obtaining silicon compounds by radiation chemistry
Irradiation of a siloxane derives SiO at low temperatures and forms the basis for a closed cycle reforming the siloxane that decomposes water to produce H.sub.2...
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