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Searching: chemistry





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Patent # Description
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...
US-4,351,949 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-4,350,627 Biologically active peptides
There is disclosed biologically active peptides of the formula ##STR1## where X is a hydrogen atom, an N-terminus protecting group (any of an acyl-type...
US-4,349,670 Process for the preparation of cationic dyestuffs
To prepare dyestuffs of the general formula ##STR1## in which R.sup.1 and R.sup.2 represent methyl or ethyl, n represents 0 or 1, B represents the divalent...
US-4,343,749 Process for the preparation of monohydroperfluoroalkane-sulfonic acid halides and some specific representatives...
Monohydroperfluoroalkanesulfonic acid halides of the formula I ##STR1## in which R.sub.f =F or perfluoroalkyl, X=Cl or F and n=1-7, are prepared by reacting...
US-4,343,687 Production of chain reactions by laser chemistry
Directed to the use of non-resonant laser energy to initiate reactions in reaction mixtures containing ingredients of the kind and in the amounts capable of...
US-4,342,769 2-[(Methylsulfinyl)acetyl]-3-heterocyclicindoles and derivatives thereof as immunosuppressants
This invention relates to compositions of matter classified in the art of chemistry as substituted 2-[(methylsulfinyl)acetyl]-3-heterocyclicindoles, various...
US-4,341,677 Antioxidants and reinforced polymers and oil-in-water emulsions of antioxidants
Oil-in-water emulsions of antioxidants having low volatility and good thermal resistance are provided for treating fibrous reinforcements such as glass fibers....
US-4,337,135 Barrel plating apparatus
A metal plating process and apparatus is disclosed and includes a plurality of pre-plating stations comprising tanks or reservoirs containing various cleaning...
US-4,329,385 Texturing polymer surfaces by transfer casting
This invention is concerned with fabricating textured surfaces on polymers without altering their surface chemistries. A surface of a fluorocarbon polymer 10 is...
US-4,329,149 Method for spectrophotometric compensation for colorimetric reagent variation
A method for compensating for error in amount of indicator added to a sample under test in bleaching chemistry analysis involves adding a reagent system...
US-4,328,345 Pyridyl substituted indoles
This invention relates to compositions of matter classified in the art of chemistry as substituted 2-[(methylsulfinyl)acetyl]-3-heterocyclicindoles, various...
US-4,328,303 Preparation of metal containing polymeric material via laser chemistry
The production of polymeric bodies having included, isolated areas of fine metal or metal oxide particles dispersed therein by mixing a metal compound with a...
US-4,325,698 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-4,321,413 Production of ethylene glycol dialkyl ethers using dialkyl ethers
A method for the production of ethylene glycol dialkyl ethers from dialkyl ethers and ethylene glycol monoalkyl ethers by means of passing these reactants over a...
US-4,320,344 Metal-alloy thermoelectric characteristic analyzer
Apparatus for identifying the metal alloy composition of a test piece. Two thermoelectric probes are brought into contact with the test piece. Both of the probes...
US-4,316,872 Ring of cells for analytical devices
A ring of cells for analytical devices operating on the centrifugal principle and photometrically measuring a sample for analysis, the system comprising a number...
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