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Searching: chemistry





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Patent # Description
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...
US-4,366,316 1-Oxadethiacepham compounds and process for producing said compounds
Intermediates for preparing an antibacterial 1-dethia-1-oxacephalosporins which are represented by the following formula: ##STR1## wherein R is a monovalent...
US-4,363,661 Method for increasing mechanical properties in ductile iron by alloy additions
A method is disclosed of making as-cast ductile iron wherein an iron melt having a chemistry capable of forming gray iron having flake graphite is treated with a...
US-4,362,716 Dipeptides, their preparation and compositions containing them
Dipeptides of the formula: ##STR1## in which R-CO represents a fatty acid residue and the symbols R.sub.1, which are identical or different, represent...
US-4,358,439 Cyclooctapeptides
Cyclic peptides of the formula ##STR1## in which trp represents L-Trp, D-Trp, or an analogous radical which carries a halogen atom in the indole nucleus,...
US-4,353,160 Solar cell junction processing system
An integrated system and process for the continuous formation of p-n junctions in solar cells in a cost-effective manner and under computer control. The...
US-4,352,896 Polyol mixtures containing reactive blowing agents and use thereof for the production of foamed polyurethanes
This invention relates to mixtures of polyols which are liquid at room temperature with functional aldoximes as blowing agents, wherein the aldoxime groups react...
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