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| Number | Title | Issue Date |
| 4882648 | Capacitance probe for use in absorbent systems A capacitance probe having a relative thin profile and large cross section for use in short yet relatively large diameter desiccant beds is formed from two substantially identical members, each having a network of strip elements electrically and structura... | 11/21/1989 |
| 4858063 | Spiral configuration of electrodes and dielectric material for sensing an environmental property A reliable moisture-indicating capactive sensor is provided with wire electrodes at least one of which includes a coating of moisture-absorbing dielectric material by spirally twisting the wire electrodes about each other, thereby establishing a pair of e... | 08/15/1989 |
| 4831493 | Windshield moisture sensor A moisture sensor to sense rain on a windshield. The sensor members on the outboard surface of the windshield are uncoated and directly exposed to any moisture accumulation on the sensor. Leads connect the sensor to an electrical signal generator and rece... | 05/16/1989 |
| 4828589 | Filter unit with apparatus for determining the saturation of a drying cartridge An apparatus for determining the degree of water saturation of the hygroscopic desiccant of a disposable drying cartridge as a function of the variation in the dielectric constant of the hygroscopic material. The invention takes the form of a tubular capa... | 05/09/1989 |
| 4805070 | Capacitive coupled moisture sensor A rain sensor for a windshield having two sets of electroconductive coatings on opposing major surfaces of the outer glass ply of a windshield. The first set of coatings on the outer major surface of the ply are electrically insulated from but in close pr... | 02/14/1989 |
| 4761710 | Polyimide capacitive humidity sensing element The present invention relates to a humidity sensing element having a polyimide moisture sensing film. It is of a capacitive structure containing, without the use of adhesives, a polyimide film which is either sandwiched between a corrosion resisting metal... | 08/02/1988 |
| 4752855 | Capacitative-type humidity sensing element and system, and method of manufacture A humidity sensor, and particularly a sensor which can distinguish between low humidity values, for example below 60% humidity, and high humidity values, for example 90% humidity and thereover, and change the capacitance between output electrodes (5, 6) i... | 06/21/1988 |
| 4720826 | Ventilation arrangement for use in an optical recording disc An optical recording disc comprising two disc substrates, each in a cylindrical shape having a round center hole, at least one recording layer formed on the surface of at least one said disc substrate, and at least one bonding material layer is formed at ... | 01/19/1988 |
| 4651121 | Moisture sensor and a method for the production of the same A moisture sensor comprising a substrate; a bottom electrode on the substrate; a moisture sensitive film sandwiched between an upper electrode and the bottom electrode on the substrate; a pair of connection terminals one of which is extended on the substr... | 03/17/1987 |
| 4639831 | Sensor for detecting an amount of rain The present invention pertains to a transparent sensor for detecting an amount of rain positioned thereon, which does not prevent the passenger from seeing outside of a vehicle through a window glass. The raid sensor is made from transparent material, and... | 01/27/1987 |
| 4603455 | Method for making a thin-film humidity sensor for measuring absolute humidity 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... | 08/05/1986 |
| 4603372 | Method of fabricating a temperature or humidity sensor of the thin film type, and sensors obtained thereby A printed circuit type of substrate (1) has a conductive film (2) on one face which is etched to constitute a first electrode (3) shaped as a printed circuit resistance between two connection tabs (4A, 4B) and a second electrode (5) having a connection ta... | 07/29/1986 |
| 4598333 | Printed wiring board means with integral dew sensor An electronic control device utilizes a plurality of conductive areas on an associated printed wiring board to create integral dew sensors. The dew sensors are created by providing parallel conductive surfaces that are connected in turn by a resistor to a... | 07/01/1986 |
| 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 |
| 4558393 | Moisture sensor A moisture sensor comprising a substrate, a moisture sensitive polymer film having hydroxyl groups formed on said substrate, an electrode formed on said moisture sensitive film, and a chemical modification layer disposed between said substrate and said mo... | 12/10/1985 |
| 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 |
| 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 |
| 4482581 | Process for the production of a capacitive hygrometer The present invention relates to a process for producing a capacitive hygrometer, as well as to a hygrometer obtained by this process. Onto a conductive layer forming the first electrode is deposited a layer of a material with a dielectric constant varying as ... | 11/13/1984 |
| 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 |
| 4422129 | Humidity sensor A humidity sensor which varies in electrical impedance with variations in humidity in the atmosphere in which it is placed comprising a ceramic body, at least a pair of spaced electrodes disposed on said ceramic body in electrical contact therewith, and a... | 12/20/1983 |
| 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 |
| 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 |
| 4021733 | Moisture meters A meter for determining the moisture content of grain or hay uses two variable capacitors. A sample of the material is compressed between the electrodes of one of the capacitors and acts as its dielectric, while the other capacitor, with a known dielectri... | 05/03/1977 |
| 4017820 | Humidity sensor with multiple electrode layers separated by a porous monolithic ceramic dielectric structure The invention concerns a humidity or moisture sensor, with a relatively thick sensitive monolithic ceramic volume. The sensitive volume is defined by a porous ceramic material with multiple electrodes buried therein in parallel planes which extend substan... | 04/12/1977 |
| 3986110 | Water depth measuring device A device for use in determining the depth of water accumulating on the surface of a pathway, such as an airport runway or the like. A block of electrically insulative material is embedded in a pathway with the top surface of the block being substantially ... | 10/12/1976 |
| 3950698 | Arrangement for determining the moisture content of tobacco and the like The arrangement determines the moisture content of tobacco, in either leaf- or comminuted form, tobacco substitutes, other smokers' products, filter materials, cigarette and cigar papers and wrappings, related and analogous fibrous and other materials, an... | 04/13/1976 |
