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| Number | Title | Issue Date |
| 5960636 | Method and apparatus for precooling a mass prior to immersion in a cryogenic liquid An apparatus and method for precooling a mass to be cooled to a final low temperature by immersion in a cryogenic liquid, e.g. liquefied helium. The gaseous phase of the cryogenic liquid is cooled by heat exchange with a cryogenic liquid having a higher b... | 10/05/1999 |
| 5843222 | Modified cement and concrete compositions A cementitious composition comprising 0.1 to about 7.5 percent by weight of a solid residual oxidation product from the combustion of an aqueous emulsion of a naturally occurring asphalt from the Orinoco Belt of Venezuela which contains from about 100 to ... | 12/01/1998 |
| 5375580 | Internal combustion engine with cooling of intake air using refrigeration of liquefied fuel gas A turbocharged or supercharged internal combustion motive system for utilization of gaseous fuel stored as a liquid wherein the liquefied gaseous fuel is vaporized and warmed at least partially with heat removed from the compressed intake combustion air i... | 12/27/1994 |
| 4871382 | Air separation process using packed columns for oxygen and argon recovery The present invention relates to an improvement to a cryogenic air separation process having an argon sidearm column. The improvement to the process for maximizing argon recovery comprises effectuating the intimate contact of the liquid phase stream and t... | 10/03/1989 |
| 4869929 | Process for preparing sic protective films on metallic or metal impregnated substrates Silicon carbide protective films are produced on the surface of metallic or metal-impregnated substrates. A silicide or silicon diffusion coating is initially formed on the surface of the substrate, and subsequently said surface is treated with a gas stre... | 09/26/1989 |
| 4869894 | Hydrogen generation and recovery High yields of hydrogen of high purity are obtained from a methane-rich gas stream, such as natural gas, by a particular combination of operations wherein the methane-rich gas undergoes primary steam reforming under less severe operating conditions includ... | 09/26/1989 |
| 4869890 | Control of nitric acid plant stack opacity during start-up and shutdown The present invention is a process for the control of nitric acid plant stack opacity in the range from 0 to 10 percent during plant startup and shutdown. The process is a series of sequential steps which encompass maximizing pressure, water and air flow ... | 09/26/1989 |
| 4869883 | Inert gas purifier for bulk nitrogen without the use of hydrogen or other reducing gases The present invention relates to a three stage process using copper, copper oxide and molecular sieve adsorbent beds for the sequential removal of oxygen, hydrogen, carbon monoxide, carbon dioxide and water from an inert feed gas. The process is especiall... | 09/26/1989 |
| 4869749 | Chemical dehydrogenation of molten ferrous alloys using a halogen-containing compound The present invention is a process for the removal of hydrogen from molten ferrous alloys in the unkilled state via a chemical reaction with a halogen-containing compound. The halogen-containing compound is typically introduced into the molten alloy in th... | 09/26/1989 |
| 4869741 | Ultra pure liquid oxygen cycle The present invention is a process for the production of 99.999+% pure oxygen. The process comprises a cryogenic distillation system which removes impurities from oxygen. The process can be operated independently of an air separation unit by using an exte... | 09/26/1989 |
| 4869742 | Air separation process with waste recycle for nitrogen and oxygen production The present invention is an improved process for the production of nitrogen and oxygen that uses a double distillation column arrangement. The improvement to the process is the recycling of at least a portion of the oxygen-enriched waste stream to the bot... | 09/26/1989 |
| 4868335 | Separation of mono-n-hexylamine-water azeotrope This invention relates to a process for separating mono-n-hexylamine from water and particularly to an improvement in a process for the recovery of mono-n-hexylamine from the reaction of n-hexanol with ammonia under amination conditions. In this process w... | 09/19/1989 |
| 4867773 | Cryogenic process for nitrogen production with oxygen-enriched recycle A process is set forth for recovery of nitrogen from a feed gas stream, containing nitrogen and oxygen, using a cryogenic separation wherein a recycle stream having an oxygen content above that of the feed gas stream is recycled separately and independent... | 09/19/1989 |
| 4866950 | Method and apparatus for cooling fruit to a select temperature A process and apparatus for extracting musts from fruit by rapid cooling said fruit to a temperature below 0° C. followed by homogenizing the temperature of batches of said fruit prior to processing. The apparatus includes a cryogenic tunnel freezer in c... | 09/19/1989 |
| 4866946 | Spiral cryogenic freezer A method and apparatus for controlling movement of the refrigerated atmosphere (e.g. gaseous cryogen) contained inside the insulated chamber of a spiral type freezer out of, or ambient atmosphere into, the lower opening of the freezer by establishing a po... | 09/19/1989 |
| 4866096 | Stable fluorochemical aqueous emulsions A stable aqueous emulsion of perfluorochemical, a phospholipid and a triglyceride of fatty acids has been demonstrated which has enhanced stability, diminished particle size and heightened tolerance by biological systems. The emulsion has utility as an ox... | 09/12/1989 |
| 4864943 | System for burning pulverized fuel Enhanced combustion of pulverized fuel in an oxy-fuel burner (10) is achieved by replacing the conventional pulverized fuel feed with a dense phase material flow transport system. This enables materials which would hitherto have been discarded as waste to... | 09/12/1989 |
| 4863761 | Continuous process for making coated composite hollow fiber membranes The present invention is a process for applying a semi-permeable coating on a hollow fiber substrate. The hollow fiber substrate is continuously passed through a polymeric coating solution and withdrawn from the solution through a coating die to form a un... | 09/05/1989 |
| 4864055 | Self- and diol reactive formaldehyde-free crosslinking monomers and their derived polymers A compound represented by the following formula: ##STR1## wherein R is a C3 -C24 olefinically unsaturated organic radical having functionality which renders the nitrogen atom electron deficient, the olefinic unsaturation functio... | 09/05/1989 |
| 4861533 | Method of preparing silicon carbide capillaries A capillary for use in ball bonding tools designed to bond metal leads to the bonding pads on a microchip and pads or leads on a chip support is formed by chemically vapor depositing a substantially smooth silicon carbide coating having high electrical re... | 08/29/1989 |
| 4861351 | Production of hydrogen and carbon monoxide Substantially pure hydrogen and high purity carbon monoxide are produced and recovered from a methane-rich gas composition, such as natural gas, by subjecting such composition to steam reforming in a first stage at relatively mild conditions, followed by ... | 08/29/1989 |
| 4859774 | Flowable triethylenediamine The flowability of stored triethylenediamine is improved by admixing with a flow promoting amount of a salt, amide or ester derivative of a C8 -C22 fatty acid. Especially suitable flow promoting additives for triethylenediamine are s... | 08/22/1989 |
| 4859527 | Cellulosic nonwoven products of enhanced water and/or solvent resistance by pretreatment of the cellulosic fibers In a method for bonding a nonwoven web of cellulosic fibers by depositing a polymeric binder on the web, the improvement comprising (1) pretreating the cellulosic fibers by depositing up to about 10 wt % of an adhesion-promoting compound which demonstrates adh... | 08/22/1989 |
| 4859435 | Deoxygenation of inert gas streams with methanol The present invention is directed to a process for removing minor amounts of oxygen from inert gas streams to result in very low levels of oxygen contamination in such inert gas streams, wherein the oxygen is removed by the action of stoichiometric quanti... | 08/22/1989 |
| 4859434 | Production of endothermic gases with methanol The present invention is directed to a process for producing endothermic gases from methanol and inert gas streams containing minor amounts of oxygen, wherein the oxygen is reacted with stoichiometric excess quantities of methanol over a catalyst as ambie... | 08/22/1989 |
| 4859215 | Polymeric membrane for gas separation The present invention is a modified polymeric membrane having improved selectivity for separating gas mixtures. The membrane comprises a silyl substituted polyacetylene polymer to which has been added 5 to 50 wt. % of an additive which is miscible with th... | 08/22/1989 |
| 4857282 | Combustion of black liquor A process for combusting black liquor by enriching the normal process air used in the combustion process by the addition of up to 5% oxygen.... | 08/15/1989 |
| 4857083 | Vacuum swing adsorption process with vacuum aided internal rinse The present invention is a continuous vacuum swing adsorption process for the fractionation of a multi-component feed gas mixture containing methane as a primary component and predominantly CO2 as a secondary component. Mulit-component feed gas... | 08/15/1989 |
| 4857082 | Membrane unit turn-down control system A permeator system for separating at least one gaseous component from a feed gas mixture containing at least one other component using a semi-permeable membrane is disclosed which maintains high permeate product purity and desired component recovery durin... | 08/15/1989 |
| 4856284 | Automated cylinder transfill system and method A system and method for loading liquid gases into a container includes supplying substance to a pump simultaneously with the evacuation of the container for cooling the pump down during evacuation and starting the pump motor when the pump has reached a lo... | 08/15/1989 |
| 4855594 | Apparatus and process for improved detection limits in mass spectrometry A system and method for detecting trace levels of a sample gas in a mass spectrometer having a vacuum chamber with a vacuum pump, an ionizer, extracting and imaging lens and a detector. A high pressure sample gas pulse is introduced into the vacuum chambe... | 08/08/1989 |
| 4855425 | Process for the selective synthesis of ethylene diamines The present invention is a process for the selective synthesis of alkanediamines by reacting a secondary amine with an alkanediol. High conversions and high selectivity for the production of alkanediamines is achieved by carrying out the reaction in the p... | 08/08/1989 |
| 4855188 | Highly erosive and abrasive wear resistant composite coating system A highly erosive and abrasive wear resistant composite coating system is described in which an intermediate layer of substantially pure tungsten is deposited on a substrate. An outer layer is then deposited comprised of a mixture of tungsten and tungsten ... | 08/08/1989 |
| 4855048 | Air dried cellulose acetate membranes The method of preparing dried asymmetric cellulose acetate blend membranes through the use of at least one drying agent which is a hydrophobic organic compound, such as polysiloxanes, hydrocarbons, ethers, ketones, chlorohydrocarbons or nitrohydrocarbons.... | 08/08/1989 |
| 4851821 | Disposable chemical container A disposable container for shipping a hazardous or ultra-high purity liquid material is disclosed, having a body of substantially vapor-impermeable organic polymer material, such as fluorinated linear high-density polyethylene, a bubbler tube extending fr... | 07/25/1989 |
| 4851579 | Alkylation of aromatic amines over Al exchanged zeolites This present invention is a process for alkylating aromatic amines to form ortho-alkylated products in high selectivity relative to N-alkylated products. Aromatic amines are contacted with an olefin or an alcohol in the presence of an ion exchanged zeolit... | 07/25/1989 |
| 4851472 | Copolymers of vinyl alcohol and fluorine-containing acrylate monomers A vinyl alcohol copolymer comprising the following general structure: ##STR1## wherein R is hydrogen or methyl; X is an organic linking group such as ##STR2## R1 is C1 -C4 alkyl; Rf is a perfluoronated alky... | 07/25/1989 |
| 4851255 | Ion implant using tetrafluoroborate Metal tetrafluoroborates, alkali and alkaline earth tetrafluoroborates in particular, and preferably lithium tetrafluoroborate are used as ion source materials in ion implantation of semiconductor materials with boron.... | 07/25/1989 |
| 4849553 | Perfluorinated dibutyl derivatives compounds Novel compositions of matter are disclosed having the formula: ##STR1## wherein the carbon rings are fully fluorinated to remove all hydrogens and olefinic character. The compositions have utility as heat transfer agents, hydraulic fluids, vapor phas... | 07/18/1989 |
| 4848996 | Nitrogen generator with waste distillation and recycle of waste distillation overhead The present invention is an improvement to a standard nitrogen generator. The improvement is two-fold; first, the addition of one or more distillation stages above the reboiler, which stages effectively transform the reboiler/condenser into a partial low ... | 07/18/1989 |
