Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 7049622 | Optical position sensor for determining the interface between a clear and an opaque fluid An inexpensive, optical position sensor for measuring a position or length, x, along a one-dimensional curvilinear, coordinate system. The sensor can be used, for example, to determine the position of an interface between a clear and an opaque fluid (such as crude o... | 05/23/2006 |
| 6949758 | LCC-based fluid-level detection sensor A non-mechanical fluid level sensor based on light communication channel (LCC) technology. In a preferred embodiment, one end of the LCC is connected to a signal source while another end is connected to a sensor. The LCC is dipped in a fluid container and a signal p... | 09/27/2005 |
| 6921911 | Method and device for optically determining a filling level in liquid-filled containers In a method of optically determining a level of liquid in a liquid-filled container a light guide body projects into the container. The light guide body has an end face for the entry and exit of light and stepped side faces forming separate reflection faces. The lig... | 07/26/2005 |
| 6522086 | Photo curing light system having modulated light intensity control A photo-curing light system in which a modulation of the light intensity or output is controlled via an analogue control voltage to the control line output of the lamp power supply. The control signal results in the lamp current being reduced from its max... | 02/18/2003 |
| 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 |
| 6172377 | Fluorescent optical liquid level sensor A liquid level sensor comprising a transparent waveguide containing fluorescent material that is excited by light of a first wavelength and emits at a second, longer wavelength. The upper end of the waveguide is connected to a light source at the first wa... | 01/09/2001 |
| 5743135 | Optical-fiber liquid-level monitor A liquid level monitor uses a tube to confine a float to a vertical path with a canister containing a lower liquid and an upper liquid which meet at a liquid boundary, the level of which is to be monitored. Light from a light-emitting diode is conveyed to... | 04/28/1998 |
| 5627380 | Fluid gauging apparatus using integral electrical sensor and a stick gauge Apparatus for detecting fluid level in a container, comprises a housing adapted to be disposed in the container; a float with an associated magnetic element, the float position corresponding to fluid level in the container; a magnetostrictive sensor dispo... | 05/06/1997 |
| 5399875 | Liquid gauging apparatus and remote sensor interrogation A liquid gauging system for a liquid container, the system comprising sensor means for producing a first electromagnetic signal that corresponds to liquid quantity in the container, and remote interrogation means for receiving the first electromagnetic si... | 03/21/1995 |
| 5367175 | Method of measuring liquid level with a thermal interface detection A method of measuring the position of a liquid surface within a vessel is scribed. An optical fiber is provided which has first and second ends and has an energy-absorbing element of a predetermined length disposed upon a portion of the cladding thereof s... | 11/22/1994 |
| 5362971 | Fiber optic detection system A fiber optic detection system in which a single optic fiber has a U-shaped configuration. A source of light is disposed at one upper free end of the optic fiber and a light detector is disposed at the other upper free end of the optic fiber. At the botto... | 11/08/1994 |
| 5303586 | Pressure or fluid level sensor A moveable body, cladding medium, and fiber are arranged to form a sensor suitable for use in monitoring changes in liquid, fluid, and material level and changes in pressure. The moveable body moves in response to changes in pressure or force. Movement of... | 04/19/1994 |
| 5220180 | Fiber optic fuel and liquid gauge having an open rigid "J" shaped tube A fiber optic fuel or liquid level gauge is disclosed which determines the liquid level by measuring the amount of light loss due to evanescent transfer to the fuel or liquid. An optical fiber is supported in the fuel or liquid tank, with a first end adja... | 06/15/1993 |
| 5077482 | Liquid gauge having an optical fiber with flexible membrane enclosure A fiber optic fuel or liquid level gauge is disclosed which determines the liquid level by measuring the amount of light loss due to evanescent transfer to the fuel or liquid. An optical fiber is supported in the fuel or liquid tank, with a first end adja... | 12/31/1991 |
| 4880990 | Optical liquid-level sensing apparatus An optical sensor element provides cantilevered support of a bent length of glass-rod core of first refractive index having a cladding of second refractive index that is less than the refractive index of the core, and wherein the outer radius of the bend ... | 11/14/1989 |
| 4764671 | Fiber optic fluid sensor using coated sensor tip An optical fluid sensing apparatus comprising a sensing tip having a conical configuration with a coating, such as a thin layer of polytetrafluoroethylene (PTFE), on the outer surface of the tip element itself. At the sensing tip, emitted light is either ... | 08/16/1988 |
| 4644177 | Fluid level and condition detector system A fluid level and condition detector system including a multimode optical waveguide for insertion into a medium including at least a first fluid whose level is to be monitored, a source of radiation for introducing into one end of the waveguide radiation ... | 02/17/1987 |
| 4342919 | Fiber optical measuring device The invention relates to a fiber optical measuring device for measuring physical parameters of a medium, preferably the level thereof, and it comprises an electronic unit and a transducer unit interconnected by an optical fiber, the transducer including a... | 08/03/1982 |
