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Searching: chemistry





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Patent # Description
US-4,527,240 Balascopy method for detecting and rapidly evaluating multiple imbalances within multi-parametric systems
In a system in which multiple related parameters, such blood chemistry data, are to be evaluated, such evaluation is facilitated by converting the data into...
US-4,523,950 Boron containing rapid solidification alloy and method of making the same
A homogeneous boron containing alloy is disclosed with a composition which can be essentially represented by the formula of: M.sub.i T.sub.j B.sub.k where M is a...
US-4,523,484 Dilution pipetter
A dilution pipetter comprising a diluent sucking probe, a sample probe for sucking and discharging a liquid sample, a diluent discharging probe disposed adjacent...
US-4,521,618 Process for preparing acrylic or methacrylic acid
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-4,521,275 Plasma etch chemistry for anisotropic etching of silicon
A plasma etch chemistry which allows a near perfectly vertical etch of silicon is disclosed. A Cl-containing compound such as BCl.sub.3 has Br.sub.2 added to it,...
US-4,520,207 Synthesis of thiophene-containing prostaglandin endoperoxide analogs
New organopalladium reactions involving the addition of thienylpalladium compounds to strained bicyclic alkenes, and subsequent chain extension reactions...
US-4,520,185 Alkanolamine linked epoxy-urethanes
Novel epoxy-urethane resins are produced by the reaction of an epoxy-alkanolamine adduct and a urethane prepolymer. The epoxy-alkanolamine adduct is prepared by...
US-4,519,541 Torch flame spray system
A flame spray system comprising a torch is provided having a gas mixing chamber and means for feeding acetylene and oxygen to the mixing chamber in a preselected...
US-4,515,792 Tetracyclic heterocycles and antidepressant compositions thereof
Tetracyclic heterocycles of the formula ##STR1## wherein Th is the residue completing a fused thiophen ring, X represents oxo, hydroxyl together with...
US-4,512,645 Film processor tank with tank divider
An improved film processor tank for processing photographic film and paper. The tank characterized by having an integrally formed round bottom with a contoured...
US-4,508,644 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-4,507,232 Peptide derivatives
This invention is directed to novel peptide derivatives. Said peptide derivatives are useful as a substrate for the activity assay of enzymes of the group EC 3....
US-4,504,658 Epimerization of malonic acid esters
A compound represented by the formula (II) epimerizes by the action of a base and the product is precipitated for shifting the equilibrium to yield the...
US-4,499,038 Process for the production of microcellular moldings from diisocyanate and compounds containing groups obtained...
The present invention is directed to a process for the production of polyurea-based microcellular moldings comprising reacting (a) at least one diisocyanate or...
US-4,497,734 Asymmetrical 1:2 chromium complexes derived from azo and azomethine dyes
Asymmetrical 1:2 chromium complex dyestuffs which, in the form of the free acid, correspond to the formula ##STR1## wherein X represents CO or a direct bond...
US-4,490,209 Plasma etching using hydrogen bromide addition
The disclosure relates to a plasma etch chemistry which allows a near perfectly anisotropic etch of silicon. A Cl-containing compound such as HCl has HBr added...
US-4,474,967 8-Deutero and 8-tritio-substituted derivatives of D-4S-6-fluoro-spiro-[chroman-4,4'-imidazolidine]-2',5'-dione
The 8-deutero, and 8-tritio-substituted derivatives of D-4S-6-fluoro-spiro-[chroman-4,4'-imidazolidine]-2',5'-dione (sorbinil) have been prepared. These...
US-4,469,683 3"-Epistreptomycin and its dihydro derivative, pharmaceutical compositions and production of the same
New semi-synthetic antibiotics, 3"-epistreptomycin and 3"-epidihydrostreptomycin are now provided, which are useful as antibacterial agents....
US-4,469,574 Process and automated device for laser-induced chemistry
This invention relates to an automated apparatus for use with electromagnetic radiation, such as a laser beam, to promote chemical reactions. The reaction...
US-4,469,564 Copper electroplating process
A copper electroplating process is described in which the anode is surrounded by a cation-permeable membrane so as to prevent decomposition of additives in the...
US-4,467,115 Method for preparing branched polyethylenimine
The present invention relates to the chemistry of polymers and, more specifically, to a method for preparing of branched polyethylenimine. The method of this...
US-4,464,206 Wrought P/M processing for prealloyed powder
A process for producing a wrought product of improved ductility from substantially noncompactible prealloyed metal powder. The process comprises the steps of:...
US-4,458,072 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-4,456,769 Preparation of hydrazidines
A new one-step process for the preparation of hydrazidines of the general formula ##STR1## in which R represents an optionally substituted alkyl group, an...
US-4,450,042 Plasma etch chemistry for anisotropic etching of silicon
A plasma etch chemistry which allows a near perfectly vertical etch of silicon is disclosed. A Cl-containing compound such as BCl.sub.3 has Br.sub.2 added to it,...
US-4,446,326 Cationic naphtholactam dyestuffs
Cationic dyestuffs of the general formula ##STR1## wherein R represents hydrogen or an alkyl radical with a maximum of 8 C atoms, which is optionally...
US-4,443,629 Preparation of hydrazidines
A one-step process for the preparation of hydrazidines of the general formula ##STR1## in which R represents an optionally substituted alkyl group, an...
US-4,443,598 1-Oxadethiacepham compounds
Intermediates for preparing an antibacterial 1-dethia-1-oxacephalosporins which are represented by the following formula: ##STR1## wherein R is a monovalent...
US-4,443,254 Cobalt free maraging steel
The subject invention is directed to ferrous-base alloys, particularly to a cobalt-free maraging steel of novel chemistry characterized by a desired combination...
US-4,442,236 Process for the production of molded articles
A process for the production of optionally cellular molded articles with a smooth outer skin and improved surface characteristics by the reaction, inside a...
US-4,436,934 Bicyclic prostaglandin analogs and method of synthesis
New organopalladium reactions involving the addition of pi-allylpalladium compounds to strained bicyclic alkenes, and subsequent chain extension reactions...
US-4,435,808 Production of radiation at frequencies of preselected absorbing resonances and methods using same
Radiation at the frequency of a preselected absorbing resonance is produced by use of split and recombined interfering optical paths, arranged to produce near...
US-4,435,575 Process for preparing carboxylated organic compounds
A process is herein described for preparing carboxylated organic compounds (acids, esters, alkaline salts) of formula ##STR1## wherein R is a hydrocarbyl...
US-4,424,349 Process for the preparation of cationic hydrazone dyestuffs
Dyestuffs of the general formula ##STR1## wherein R.sub.1 denotes alkyl, alkenyl, aralkyl or cycloalkyl, R.sub.2 denotes hydrogen, alkyl, alkenyl, aryl, aralkyl...
US-D272,087 Clinical chemistry analyzer
US-D271,619 Specimen cup assembly for a clinical chemistry analyzer
US-4,415,857 Non-polarizing electrode system for geophysical prospecting and the like
In electrical geophysical prospecting and in well-logging, in which potential is applied to the earth to cause direct current (or low frequency alternating...
US-4,412,005 Determination of total bilirubin
A direct, spectrophotometric method for determining the total bilirubin content of an aqueous liquid is provided by detecting the absorption spectrum of the...
US-4,411,946 Impregnating paper with 7-hydroxy-coumarin compounds
7-Hydroxy-coumarin compounds of the general formula ##STR1## wherein A represents a heterocyclic radical, which can contain non-ionic substituents customary...
US-4,411,713 Shell for a composite roll
In the manufacturing of a shell for a cast iron rolling mill roll, heating the chill prior to casting so that the chill at the time pouring commences is in the...
US-4,409,182 Colorimeter test kit apparatus
A method and apparatus for the colorimetric testing of non-opaque fluids that comprises compact test kit apparatus made from readily available plastic...
US-4,404,379 Cycloaminals and a process for their preparation
The present invention is concerned with a new class of compounds prepared by reacting cyclic aminals of the formula ##STR1## with polyisocyanates of the...
US-4,400,481 Finisher and preserver for lithographic plates
Finisher and preserver compositions are provided for desensitizing the non-image areas and protecting the image areas of lithographic plates of either the...
US-4,399,131 Cephem derivatives
What are disclosed are cephem compounds of the formula ##STR1## in which R.sub.1 denotes hydrogen, an optionally substituted alkyl, acyl, arylsulfonyl or...
US-4,398,888 Molecular model for chemistry
A molecular model building set for the formation of models of molecules and compounds primarily in the field of organic chemistry is disclosed. The set includes...
US-4,393,506 Sealed-off RF excited CO.sub.2 lasers and method of manufacturing such lasers
A method is disclosed for manufacturing a sealed-off RF excited CO.sub.2 laser with a longer operating life. The invention, which relates to the method and the...
US-4,386,073 Tripeptides acting on the central nervous system and a process for the preparation thereof
The invention relates to new peptide derivatives which act on the central nervous system and correspond to the general formula (I), wherein X is L-pyroglutamyl,...
US-4,383,028 Photographic chemistry
A photographic chemistry comprised of a solution containing a mixture of different chemicals which cooperate to minimize the need for long film exposure times to...
US-4,373,967 Process for making resulfurized machinable steel
A melt is produced composed of iron, manganese and carbon in known ratios for free-cutting carbon steel with sulfur being included at roughly 0.15%. Aluminum and...
US-4,369,179 Acylpeptides
Acylpeptides derived from somatostatin or from a derivative thereof having analogous action, in which the amino acids sequence is modified by omitting individual...
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