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| Number | Title | Issue Date |
| 4256694 | Carbon monoxide monitoring system Colorimetric indicator material comprising alumina impregnated with permanganate ion and silver ion which changes color from purple to brown in the presence of carbon monoxide is disclosed. A personal monitor containing permanganate ion and silver ion imp... | 03/17/1981 |
| 4251225 | Method of detecting carbon monoxide Method of detecting carbon monoxide gas at temperatures of 100° C. or less by using a detecting element containing stannic oxide as the main component, which element is prepared by mixing stannic oxide, antimony trioxide and platinum in atomic ratios of ... | 02/17/1981 |
| 4251674 | Method and apparatus for improving the selectivity of a process for hydrogenating acetylene to ethylene In an ethylene manufacturing process in which the effluent from the cracking furnaces is provided to an acetylene reactor to therein selectively hydrogenate acetylene to ethylene, method and apparatus is provided whereby methanol is injected into the crac... | 02/17/1981 |
| 4198850 | Gas sensors In a gas-sensitive resistor of the metal oxide type, the sensitive body is a single crystal of zinc oxide. Such a sensor has particular application in the testing of oxygen-containing atmospheres for the presence of carbon monoxide.... | 04/22/1980 |
| 4141689 | Methods and devices for determining the concentration of a component of a fluid A method of testing a body of fluid for the presence of at least one component in which a measuring means is exposed successively to two masses of fluid derived from the body of fluid, the two masses differing in respect of the concentration of an active ... | 02/27/1979 |
| 4123227 | Method and apparatus for evaluating changes in indicator tubes Device for determining variations within an indicator tube having a material which varies in light intensity or color in the presence of particular gases, comprises a first set of light barrier devices as light sources and photoelectric cells on respectiv... | 10/31/1978 |
| 4121922 | Method and apparatus for measuring percentage reduction in a metal ore reduction reactor A method and apparatus for measuring the percentage reduction of iron ore in a reduction reactor of a multiple reactor gaseous reduction system. In accordance with a preferred embodiment, the flow and composition of the reducing gas fed to the reduction r... | 10/24/1978 |
| 4115067 | Pollution monitoring apparatus Apparatus for the detection and/or analysis of pollutant gases comprising a light-reflective surface sensitive to a pollutant gas which is capable of reaction with the pollutant gas to cause a decrease in the reflectivity of the surface, light source mean... | 09/19/1978 |
| 4063898 | Combustible gases detector A differential thermocouple combustible gas detector is provided by coating one thermocouple junction of a differential thermocouple pair with a catalyst and the other thermocouple junction with a non-catalyst. Heated combustible gases react with the cata... | 12/20/1977 |
| 4043934 | Catalyst and method for oxidizing reducing gases A reducing gas, such as, carbon monoxide (CO) or unsaturated hydrocarbons, is oxidized by contacting a mixture of the gas and oxygen with a catalyst or reagent which includes palladium sulfate and ammonium molybdate adsorbed on silica gel. The reducing ga... | 08/23/1977 |
| 4032297 | Pollution monitoring apparatus Apparatus for the detection and/or analysis of pollutant gases comprising a light-reflective surface sensitive to a pollutant gas which is capable of reaction with the pollutant gas to cause a decrease in the reflectivity of the surface, light source mean... | 06/28/1977 |
| 4030887 | Carbon monoxide detection apparatus and method A carbon monoxide removing catalytic material is disposed in one end of a first hollow column having open ends while porous inactive material is disposed in one end of a similar second column to offer substantially the same resistance to air flow as the c... | 06/21/1977 |
| 4012692 | Method and apparatus for determining the concentration of one gaseous component in a mixture of gases The concentration of one or more gaseous components of a mixture of gases is determined using a metallic oxide semiconductor the electrical resistance of which changes in the presence of reducing gases. The speed of reaction, relative to the speed of sorp... | 03/15/1977 |
| 4000089 | Element for detecting carbon monoxide This invention relates to an element which can detect selectively carbon monoxide from other reducing gases contained in air. The element has a sensitive response to carbon monoxide at a comparatively low temperature and not to other reducing gases. The e... | 12/28/1976 |
| 3985017 | Gaseous contaminate dosimeter and method A gaseous contaminate personal dosimeter which comprises a container; an inert porous thin barrier element forming one side of the container, the barrier element adapted to permit the diffusion of the gaseous contaminates that are to be determined into th... | 10/12/1976 |
| 3982897 | Filter and detector and methods of using same in the removal and detection of carbon monoxide from, and in, a gas stream The quantity of carbon monoxide removed from a gas stream by a filter containing hemoglobin is greatly enhanced in quantity when the hemoglobin is accompanied by another factor present in blood. The quantity of carbon monoxide removable from a gas stream ... | 09/28/1976 |
| 3977831 | Method for detecting pollutants A method for detecting and measuring trace amounts of pollutants of the group consisting of ozone, nitrogen dioxide and carbon monoxide in a gaseous environment wherein a sample organic solid material that will undergo a chemical reaction with the test po... | 08/31/1976 |
| 3970431 | Carbon monoxide gas detector An indicator of the presence and changes in the carbon monoxide content of the air is provided by this invention. It operates by measuring the change in resistance of a silver oxide when exposed to carbon monoxide.... | 07/20/1976 |
| 3955929 | Gas detecting sensor Gas detecting sensor made of SnO2 characterized by containing less than 5% by weight of at least one of Al2 O3, ZnO, SrO and BaO and less than 1% by weight of chlorine. The gas detecting sensor has a high sensitivity selec... | 05/11/1976 |
| 3955268 | Method of fabricating an electrolytic cell gas sensor A Solid State Electrolytic Cell Gas Sensor is presented which is capable of measuring various toxic or combustible gases in low concentrations (0-5 PPM) up to and including high concentrations such as 0-20 percent by volume. The sensor exhibits excellent ... | 05/11/1976 |
| 3953173 | Gas-sensor element and method for detecting oxidizable gas A gas-sensor element for detecting oxidizable gases and vapors such as alcohols for carbon monoxide, which is characterized by comprising a complex metal oxide having the K2 MgF4 -type crystal structure and represented by the general... | 04/27/1976 |
| 3951603 | Gas-sensor element and method for detecting reducing gas or oxygen gas A gas-sensor element for detecting reducing gases and vapors such as alcohols or carbon monoxide, or for determining oxygen concentration, which is characterized by comprising a complex metal oxide having a perovskite-type crystal structure and represente... | 04/20/1976 |
| 3943750 | Probe collector for subterranean gases A gas probe for penetrating the earth to sample gasses therefrom such as gases of putrefaction in a suspected burial area. A cylindrical sampling conduit extends from an outlet at the top to a sampling manifold having at least one outwardly opening at the... | 03/16/1976 |
| 3933433 | Method and apparatus for gas detection A method of gas detection and differentiation between various noxious gases including exposing a semi-conductor catalytic sensor in the atmosphere to be evaluated, sequentially providing first and second voltage level inputs to the sensor, and determining... | 01/20/1976 |
