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Searching: chemistry





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Patent # Description
US-4,176,024 Gas dynamic reaction process and system for laser chemistry
A reaction system is disclosed wherein a moving, unidirectional stream of an activatable gaseous species is produced, the individual members of which have the...
US-4,172,432 Oxygen sensor monitor apparatus
For use in association with a fuel mixture preparation system of an internal combustion engine which uses closed-loop control based on exhaust chemistry as...
US-4,172,078 Thiazolineazetidinone derivatives
Thiazolineazetidinone derivatives of the formulae 1,2, and 3. ##STR1## wherein R is derived from the commonly known carboxamido groups present in ...
US-4,171,233 Lens quality of die steel
A die steel having high hardenability, high hardness, good toughness and capable of achieving a high polished surface flatness in the air or oil quenched and...
US-4,166,736 Powdered metal filter composition and processes for producing the same
A powdered metal filter composition and processes for producing the same by water atomization in which the composition exhibits an apparent density, ...
US-4,163,811 Method of fabricating a fuel cell electrode
Electrocatalyst and hydrophobic polymer particles are combined to form an aqueous suspension which is then applied to a conductive substrate to form an...
US-4,153,005 Multiple electron beam vacuum vapor deposition apparatus
A vacuum vapor deposition apparatus having a plurality of electron beam sources spaced about the periphery of the molten alloy pool is provided. The electron...
US-4,151,503 Temperature compensated resistive exhaust gas sensor construction
A pair of ceramic chips, formed of similar metal oxide ceramic materials which are semiconductors at elevated temperature, are connected electrically in series...
US-4,150,127 Novel steroid compounds having an oxygen function in the 19-position
Novel 19-oxygenated steroids of the 20-spiroxane series of the formula ##STR1## in which R.sup.3 is a lower alkyl radical carrying an oxygen-containing ...
US-4,149,162 Battery discriminator circuit for smoke detectors
A battery powered smoke detector includes a battery powered discriminator circuit which periodically senses the chemistry of the battery represented by its...
US-4,146,449 Purification of silane via laser-induced chemistry
Impurities such as PH.sub.3, AsH.sub.3, and B.sub.2 H.sub.6 may be removed from SiH.sub.4 by means of selective photolysis with ultraviolet radiation of the...
US-4,145,343 6'-Amino-spiro[cycloalkane-1,2'-penam]-3'-carboxylic acid derivatives
6'-Amino-spiro[cycloalkane-1,2'-penam]-3'-carboxylic acid derivatives having the formula ##STR1## WHEREIN N IS A WHOLE NUMBER OF FROM 3 TO 6 AND R.sub.1 and...
US-4,144,151 Production of B.sub.10 H.sub.14 from B.sub.2 H.sub.6 at room temperature by laser induced chemistry using DF laser
A method for the production of B.sub.10 H.sub.14 by laser induced chemistry is disclosed. A DF laser is used to irradiate a laser reaction cell containing...
US-4,141,856 Reference material for establishing anion concentrations in analytical chemistry tests
A composition for reconstituting blood serum to provide a control standard used in the analysis of blood serum, said composition comprising a quaternary ammonium...
US-4,139,628 Amino-spiro[oxa(or thia)cycloalkane-penam]-carboxylic acid derivatives
Amino-spiro[oxa(or thia)cycloalkane-penam]-carboxylic acid derivatives having the formula ##STR1## WHEREIN X is a sulfur or oxygen atom or the sulfinyl...
US-4,134,785 Real-time analysis and control of melt-chemistry in crystal growing operations
To improve the control over resistivity of grown single crystalline ingots, to reduce the turn-around time between growth of successive ingots in a particular...
US-RE29,881 Method of vacuum carburizing
A method and apparatus of vacuum carburizing by changing the surface chemistry of a metal article through absorption and thermal diffusion of carbon, wherein...
US-4,122,037 Preparation of an aqueous solution containing ions of at least manganous and bromide ions from a water soluble...
This invention relates to the preparation of the subject aqueous solution from a non-bromine manganous salt. More specifically this invention pertains to a...
US-4,121,237 Method and apparatus for processing photographic film
A photographic film developing process and apparatus incorporating a processing chamber in which a resilient membrane forms one wall of the chamber. A...
US-4,119,403 Method and apparatus for temperature controlled samplers
The invention pertains to "wet chemistry" analytical devices for pollutant gases in air. Numerous improvements are provided including a thermo-electric...
US-4,116,635 General purpose in vitro anticoagulant
A process for testing a blood sample as for coagulation, hematology, chemistries, enzymes, electrolytes and trace metals which involves the addition of a...
US-4,113,527 Chrome steel casting
A low carbon Martensite transformation induced substructure, with nickel and molybdenum providing solid solution strengthening is obtained in a low ...
US-4,106,861 Reduced haze photochromic systems
The present invention is directed toward light-transmitting photochromic articles with low haze levels under illumination and processes for forming said articles...
US-4,103,771 Detecting resin cure
Commencement of resin cure may be visually observed by including a dye with the resin reactants; the dye imparts one color to the unreacted components and...
US-4,103,358 Fluid mixing and dispensing system
A fluid mixing system and method is disclosed for automatically mixing precise concentrations of photographic processing chemistry to be used in an X-ray film...
US-4,099,000 Process for preparing di-7-azido cephalosporin compounds
A novel total synthesis process is provided, yielding cephalosporin or penicillin compounds. The process uses as starting material a glycine ester, which first...
US-4,098,791 Process for preparing 3-(cyanimino)-3-amino-propionitriles
An improved multistep process for the production of intermediates for hypotensive compounds, which intermediates are of the formula V: ##STR1## wherein...
US-4,080,345 Catalyst mixture for use in trimerizing and/or polymerizing isocyanates and/or for the polyaddition of active...
Catalyst mixture for use in trimerizing and/or polymerizing isocyanates and/or for the polyaddition of active hydrogen atom containing polyethers and...
US-4,079,179 6-Loweralkoxy or loweralkylthio-3-cephem-4-carboxylic acids
Cephalosporin compounds having a loweralkoxy or loweralkylthio substituent in the 6-position are prepared by a multi-step total synthesis route using as starting...
US-4,075,072 Laser chemistry synthesis of NF.sub.4 BF.sub.4
A process for producing the product NF.sub.4 BF.sub.4 by subjecting gases .sub.3, BF.sub.3, and a gaseous source of a compound which releases fluorine gas when...
US-4,073,712 Electrostatic water treatment
A reliable and efficient device for the treatment of liquid system, to inhibit scale formation, subjects the liquid to an electrostatic field and includes a pair...
US-4,070,261 Production of B.sub.2 H.sub.6 from BCl.sub.3 + H.sub.2 at room temperature by laser induced chemistry
A CO.sub.2 laser is used to irradiate a laser cell containing gaseous BCl.sub.3 + H.sub.2 at room temperature (25.degree. C) to produce B.sub.2 H.sub.6. The...
US-4,052,161 Kinetic analyzer
A completely automated kinetic analyzer particularly suited for performing classical kinetic chemistries on an ultra-micro scale. The analyzer comprises a sample...
US-4,049,879 Intercalated transition metal phosphorus trisulfides
A new composition of matter corresponds to the formula A.sub.x M(PS.sub.3).sub.y wherein A is at least one Group Ia metal, x is a numerical value greater than...
US-4,049,472 Atmosphere compositions and methods of using same for surface treating ferrous metals
Atmosphere compositions and processes utilizing the compositions for heat treating ferrous metal articles under a controlled furnace atmosphere to either...
US-4,043,977 Non-stick polyorganosiloxane coating compositions
A composition for coating paper, films and fiber materials, comprising A. 4 parts by weight of a linear polyorganosiloxane with ends stopped by vinyl groups and...
US-4,043,933 Method of fabricating a fuel cell electrode
A method of fabricating a fuel cell electrode comprising an electrocatalyst and binder wherein the colloidal chemistry of the aqueous catalyst and the binder...
US-4,043,810 Cast thermally stable high temperature nickel-base alloys and casting made therefrom
A cast thermally stable high temperature nickel-base alloy characterized by superior oxidation resistance, sustainable hot strength and retention of ductility on...
US-4,043,559 Educational game
An educational game arrangement in which a systematic set of games may be played on a plurality of interrelated templates or game boards. The games played on the...
US-4,041,028 Chlorination of 2,3-dimethyl-1,2,4-benzothia-diazine 1,1-dioxide
Novel 2,3-disubstituted-1,2,4-benzothiadiazine 1,1-dioxides of the formula: ##STR1## wherein X is hydrogen or chlorine. The novel compositions have been ...
US-4,037,643 Nodularizing treatment employing unitized modifying agent
A method and apparatus is disclosed for conditioning a charge of molten cast iron, which would normally solidify with a flake graphite structure, to produce...
US-4,027,979 Multiple chemistry analyzer
The multiple chemical analyzer incorporates an improved multiple diluter, multiple pipettor, multiple colorimeter with probes and a signal storage device into a...
US-4,023,985 Steel abrasives and method for producing same
Disclosed is a method of producing a versatile as-cast steel shot having a substantially fully martensitic structure and corresponding full hardness which...
US-4,008,139 Fluorinated compounds
1,1,4,4-Tetrakis(trifluoromethyl)butan-1,4-diol and 1,1-bis (trifluoromethyl)propanol-1 are prepared by reacting gaseous hexafluoroacetone and ethane in a...
US-3,997,420 Automatic analyzer
An apparatus for automatically performing blood chemistry analyses and in particular the determination of the pH, PCO.sub.2 and PO.sub.2 of blood. The apparatus...
US-3,979,413 Polycyclic dyestuffs
Polycyclic dyestuffs of the formula ##SPC1## Wherein R.sub.1 and R.sub.2 represent alkyl, cycloalkyl, aralkyl or aryl or together form a ring which is optionally...
US-3,976,729 Process for producing carbon fibers from mesophase pitch
An improved process for producing carbon fibers from pitch which has been transformed, in part, to a liquid crystal or so-called "mesophase" state. According to...
US-3,976,640 Bis-type quaternary salts including benzothiazole and benzimidazole rings and process for preparing dye therewith
Novel bis type heterocyclic quaternary salts are provided which are useful in the preparation of various linked cyanine dyes and related compounds. BACKGROUND OF THE...
US-3,976,541 Secondary coolant purification system with demineralizer bypass
Apparatus and method are provided for a nuclear stream supply system for adequately controlling the chemistry of the secondary coolant. The invention includes...
US-3,970,392 Analog to digital to analog storage and retrieval for a plurality of photometric blanking values
To enable the storage and retrieval of a plurality of different aliquot valves of blanking standards or serums for photometric comparison with plural test sample...
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