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| Number | Title | Issue Date |
| 4644665 | Process for supervising and/or controlling of physical treatment processes and bioreactions in ventilation systems as well as device for executing the process In a process, the humidity of at least the exhaust air is measured and used for the regulation of the product humidity of water activity during a treatment process. Therefore, it is possible to directly register the humidity taken on by the inlet air or c... | 02/24/1987 |
| 4580354 | Method and device for measuring humidity For determining the relative humidity of a highly moist gas, particularly air exiting from a wood-drying apparatus, there is used a humidity sensing arrangement having a capacitive sensor, whose capacitance varies with changes in the relative humidity of ... | 04/08/1986 |
| 4564882 | Humidity sensing element The structure consists of a substrate, a set of interdigitated electrodes deposited on the substrate surface. The electrode fingers have a period less than the substrate thickness. A first water permeable polymer film is deposited over the electrodes and ... | 01/14/1986 |
| 4558595 | Capacitance monitoring bridge circuit for an enthalpy responsive device An enthalpy control circuit has a humidity responsive capacitive element in one leg of a bridge circuit and a temperature responsive resistance element in another leg. The circuit is powered by a pulsating DC voltage of 1 kilohertz frequency for providing... | 12/17/1985 |
| 4530030 | Thin-film humidity sensor for measuring the absolute humidity and method for the production thereof A thin-film humidity sensor for measuring the absolute humidity having a base electrode, a moisture-sensitive dielectric layer and a top electrode is formed at the end face of an electrically insulating bushing body by the thin-film technique. The connect... | 07/16/1985 |
| 4502288 | Misting control apparatus Apparatus (10) for applying mist or spray to an environment such as one in which plants (11) are growing including a monitoring head (12) arranged in the environment to sense the humidity therein by measurements of temperature and a control device (13) fo... | 03/05/1985 |
| 4500940 | Capacitive humidity sensor and method for the manufacture of same The present publication describes a capacitive humidity sensor and a method for the manufacture of same. The sensor comprises a substrate (1), first (5) and second bottom electrodes (4), which have been fitted close to each other on the substrate (1), an ... | 02/19/1985 |
| 4465229 | Humidity comfort offset circuit A humidity responsive circuit is adapted to be connected to a thermostat to provide a humidity comfort offset to the thermostat. The humidity comfort offset circuit can be added to a retrofit item or could be added during the manufacture of an electronic ... | 08/14/1984 |
| 4438480 | Capacitive hygrometer The present invention relates to a capacitive hygrometer comprising a capacitor (1) having a dielectric material (3), whose dielectric constant varies as a function of the quantity of water absorbed. It has on one of its conductive faces numerous fissures... | 03/20/1984 |
| 4429343 | Humidity sensing element A humidity sensing element of the capacitance sensing type having two sets of interdigitated fingers of thin film platinum deposited on a glass substrate, all covered by a coating of water absorbing material such as cellulose acetate butyrate or a silicon... | 01/31/1984 |
| 4393434 | Capacitance humidity sensor A capacitance humidity sensor according to the disclosure a non-conductive base plate, electrodes oppositely arranged on the base plate, a metal compound membrane formed by ion-plating independently on the electrodes, the metal compound membrane being rou... | 07/12/1983 |
| 4373392 | Sensor control circuit A sensor control circuit for detecting water vapor, various gases, etc. The sensor control circuit includes a sensor element whose impedance varies according to the concentration of water vapor, gas or the like and further includes a heating element for h... | 02/15/1983 |
| 4347550 | Sensor detector element for an electrical hygrometer A strictly capacitive sensor for an electrical hygrometer comprises an electrode in the form of a slice of doped silicon supporting a dielectric layer of hygroscopic material which in turn supports a further and permeable electrode, while the surface of t... | 08/31/1982 |
| 4345301 | Capacitive humidity transducer A capacitive humidity transducer having an electrically non-conductive dielectric base carrying a pair of electrically conductive coatings deposited directly on opposite respective sides of the non-conductive base to form parallel capacitor plates. The co... | 08/17/1982 |
| 4305112 | Capacitance humidity sensing element A multi-layered capacitive humidity sensing element having a carrier material separated from a water vapor permeable, electrically conductive coating by an insulating layer which is humidity sensitive, and a method for its manufacture is provided. A metal... | 12/08/1981 |
| 4276128 | Humidity sensing element of electric capacitance change type and method of producing same A device comprising a dielectric oxide film formed by anodization of a surface region of a valve metal body, a semiconductive metal oxide layer porously formed on the dielectric oxide film, and a gas permeable electrode layer formed on the semiconductive ... | 06/30/1981 |
| 4217623 | Humidity sensor of capacitance change type A device comprising a metal substrate serving as a first electrode, a dielectric oxide film formed by oxidation of a surface region of the substrate and a second electrode layer formed porously on the dielectric oxide film. Microscopically, the second ele... | 08/12/1980 |
| 4164868 | Capacitive humidity transducer A capacitive humidity transducer wherein an electrically non-conductive base carries at least a pair of electrically conductive coatings which are spaced from each other. A dielectric film which is active with respect to water absorption is also carried b... | 08/21/1979 |
| 4156268 | Humidity sensing element and method of manufacture thereof A doped capacitance humidity sensing element and method of manufacture thereof is provided. The element has a response time in the order of one second and has one electrode formed by an anodizable metal, an anodized layer thereon, conductive, metal atoms ... | 05/22/1979 |
