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| Number | Title | Issue Date |
| 6668645 | Optical fuel level sensor An optical fuel level sensor for providing an electronic signal representative of the fuel level within a fuel tank, generally comprising a waveguide body, a photo source, and a photo receiver. The waveguide body can either be of a dual-tapered or single-... | 12/30/2003 |
| 6658933 | Fill-level indicator for a liquefied-petroleum-gas tank Fill-level indicating device includes an array of optical detectors attached to a mount, vertically spaced apart relative to one another and distributed within the tank over the height of the latter, with each detector including a light source and a recei... | 12/09/2003 |
| 6429447 | Fluid level indicator An optical device for measuring a level of a fluid in a container wherein a light conducting body having a top surface and a bottom surface is positioned within the container and into the fluid. A first end of the light conducting body and an oppositely d... | 08/06/2002 |
| 6177874 | Liquid supplying device for providing chemical solution with a liquid level sensor A liquid supplying device comprising a liquid container for storing a liquid so as to supply an external device and a liquid level sensor for detecting the liquid level. As the liquid within the liquid container is gradually used up, liquid level drops. A... | 01/23/2001 |
| 5059812 | Control apparatus for controlling an aspirator tube in an automatic sample dispenser The control apparatus controls the lowering motion of an aspirator tube into a sample vessel in an automatic sample dispenser in a manner such that the smallest possible portion of an external surface of the aspirator tube is wetted by a liquid present in... | 10/22/1991 |
| 4994682 | Fiber optic continuous liquid level sensor A fibre optic sensor, particularly for ascertaining fluid levels, utilizes two cylindrical lightguides with regular perturbations to emit and/or accept light in a radial direction. Each waveguide is coupled to one (or more) light source and/or to one (or ... | 02/19/1991 |
| 4880971 | Fiber optic liquid level sensor A liquid level sensor comprises a probe containing closely spaced therein an elongate light emitter and an elongate light collector, the housing of the probe permitting light to issue from the interior from the emitter and to return to the collector. A li... | 11/14/1989 |
| 4870292 | Fibre optic sensor for liquid level and other parameters A fibre optic sensor, particularly for ascertaining fluid levels, utilizes at least two optical fibres having at least a portion thereof embedded in a transparent substrate material of similar refractive index. One of the fibres is coupled to a light sour... | 09/26/1989 |
| 4689484 | Photoelectric leak detection system for double-walled tanks and the like A photoelectric leak detector system for double-walled tanks and the like including a pair of optical fibers extending substantially from the top to the bottom of the annulus of the double-walled tank, a glass plate in contact with the lower ends of the o... | 08/25/1987 |
| 4503994 | Fiber optic fuel shutoff system An automatic fuel shutoff system for preventing fuel flow into a tank being filled when the level of fuel in the tank reaches a predetermined level. This system stops fuel flow when the passage of light from a light transmitter to a light receiver is bloc... | 03/12/1985 |
| 4441817 | Electro-optical sensors with fiber optic bundles Method and apparatus for determining physical characteristics of an object, such as its location, utilizing a non-coherent fiber optic bundle. In one embodiment, a non-coherent fiber optic bundle containing up to 30% randomly non-aligned fibers is utilize... | 04/10/1984 |
| 4320394 | Fiber optics liquid level and flow sensor system A fiber optics level sensor (FOLS) or flow sensor (FOFS) system for use in hazardous environments, process control, and industrial and environmental control applications. The system includes a pair of fiber optic bundles arranged between a remote sensor a... | 03/16/1982 |
| 4275295 | Limit and measurement value transmitter PCT No. PCT/CH78/00023 Sec. 371 Date May 23, 1979 Sec. 102(e) Date May 23, 1979 PCT Filed Oct. 2, 1978 PCT Pub. No. WO79/00180 PCT Pub. Date Apr. 19, 1979 In the measuring and control technics, indicators for a limit value and measurement value working fo... | 06/23/1981 |
| 4069838 | Fiber optic liquid level sensor A liquid level sensor for use when filling containers with hydrocarbons or other liquids is disclosed. A fiber optic bundle is arranged to form a flow path for a light beam in such a manner that the flow path is interrupted when the liquid level reaches a... | 01/24/1978 |
| 4039845 | Optical-electrical liquid probes An optical-electrical liquid probe for sensing the presence or absence of a liquid comprises a light emitter and a light receiver housed within a translucent hollow body. When there is no liquid adjacent a sensing part of the body, the light rays from the... | 08/02/1977 |
