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Searching: chemistry





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Patent # Description
US-4,225,664 X-ray resist containing poly(2,3-dichloro-1-propyl acrylate) and poly(glycidyl methacrylate-co-ethyl acrylate)
A mixture of poly(2,3-dichloro-1-propyl acrylate) and poly(glycidyl methacrylate-co-ethyl acrylate), with the latter forming between 1 percent and 20 percent by...
US-4,225,569 Carbon-carbon composite material and method for its production
The present invention provides a carbon-carbon composite material consisting of a matrix carbon and a fibrous reinforcing carbon, said matrix carbon and fibrous...
US-4,220,780 Cationic dyestuffs
Cationic dyestuffs of the formula ##STR1## wherein A represents oxygen, sulphur or the groupings >N--R.sub.3, ##STR2## wherein R.sub.3 denotes an...
US-4,217,054 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-4,211,886 Manufacture of benzene, toluene and xylene
Benzene, toluene and xylene are produced in high yield from aromatic naphtha by a processing technique which combines (1) high temperature isomerization of eight...
US-4,208,638 HF or DF Chemical laser using laser induced chemistry
A chemical HF or DF laser is obtained by irradiating COF.sub.2 +H.sub.2 /ub.2 in admixture with the R.sub.12 line of a CO.sub.2 laser. The irradiation is...
US-4,208,241 Device fabrication by plasma etching
High density fine-line integrated structure fabrication is expedited by use of plasma etching systems which assure straight vertical walls (absence of ...
US-4,202,736 Process and apparatus for the thorough purification of water and the highly purified water obtained thereby
The water is heated to convert it into steam; the steam is passed from a container into a superheating zone and then condensed in the form of purified water. The...
US-4,202,104 HCl or DCl Chemical laser using laser induced chemistry
A chemical HCl or DCl laser is obtained by irradiating COCl.sub.2 +H.sub.2 D.sub.2 in admixture with the P.sub.54 line of a CO.sub.2 laser. The irradiation is...
US-4,198,382 Novel carbon-carbon composite material and method for its production
The present invention provides a carbon-carbon composite material consisting of a matrix carbon and a fibrous reinforcing carbon, said matrix carbon consisting...
US-4,195,923 System for producing photographs
A portable, self contained apparatus for exposing and developing photographic film, the apparatus including a camera, a processor unit, and a manually...
US-4,192,084 Atomic model
A teaching aid which has a display board and a number of discs having symbols printed thereon and magnets for attaching the discs to the display board. The...
US-4,189,536 Reagent systems, enzymatic assays and compositions therefor
An improved reagent system for chemical determinations and novel compositions therefor provide improved reagent stability, particularly in a dry, storage stable...
US-4,189,470 Method for the continuous removal of a specific antibody from the lymph fluid in animals and humans
A process for the removal of a specific antibody from the lymph fluid free of lymph cells is disclosed. The lymph is taken from a subject (e.g., human or animal)...
US-4,187,221 Process for preparing azetidinones
A process for preparing azetidinones of the formulae 1 and 2A and the stereoisomers of the latter of formula 2B ##STR1## wherein R is an amino-protecting...
US-4,185,156 Peptides and acid addition salts thereof
The compounds of this invention represented by the following formula: ##STR1## (wherein R is hydrogen atom, an alkyl group having C.sub.1 to C.sub.4, a ...
US-4,183,850 Process for preparing 2-acyloxymethylpenams and 3-acyloxycephams
A process for preparing 2-acyloxymethylpenams and 3-acyloxycephams of the formulae 1 and 2 ##STR1## in which R represents the aliphatic, aromatic, or...
US-4,182,574 Arrangement for carrying out laser spectral analysis
The invention concerns an arrangement for enabling laser spectral analysis of chemical components contained in a target material, by utilizing the respective...
US-4,178,103 Light scattering photometer and sample handling system therefor
A laser photometer including means forming an unsupported curtain of liquid sample, means for focusing a laser beam at a sample volume in the unsupported liquid...
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...
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