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| Number | Title | Issue Date |
| 7330390 | Noise resistant small signal sensing circuit for a memory device Apparatus and method for data sensing circuitry that uses averaging to sense small differences in signal levels representing data states. The apparatus periodically switches the coupling of input terminals and output terminals of an integrator circuit from a first c... | 02/12/2008 |
| 7301641 | Fiber optic smoke detector A passive sensor housing has an air gap formed therein between a collimating lens and a lens focused mirror reflecting optical light signals transmitted through the lens into the air gap within which smoke is received through screened openings in the housing. The op... | 11/27/2007 |
| 7295295 | Paste solids measurement in real time A real-time method of determining paste solids includes: correlating the refractive index of a paste with solute concentration in a solvent using a plurality of paste solids concentrations, typically including at least two paste solids concentrations greater than ab... | 11/13/2007 |
| 7294513 | Method and apparatus for characterizing solutions of small particles A method and apparatus is described by which means molecules in suspension may be characterized in terms of the size and mass distributions present. As a sample solution is separated by centrifugal means, it is illuminated at a particular radial distance from the ax... | 11/13/2007 |
| 7285129 | High efficiency tanning apparatus Tanning apparatuses and methods of operating tanning apparatuses for high efficiency use. In an embodiment, a tanning apparatus including a tanning lamp is operated by delivering a first input voltage to the tanning lamp to generate an ultraviolet radiation output. ... | 10/23/2007 |
| 7133307 | Resistive memory element sensing using averaging A system for determining the logic state of a resistive memory cell element, for example an MRAM resistive cell element. The system includes a controlled voltage supply, an electronic charge reservoir, a current source, and a pulse counter. The controlled voltage su... | 11/07/2006 |
| 7122820 | Method for determining visibility, amount of precipitation and type of precipitation The invention is directed to a method and a combined visibility measuring and precipitation measuring instrument for determining visibility, amount of precipitation and type of precipitation. ... | 10/17/2006 |
| 7095667 | Noise resistant small signal sensing circuit for a memory device Apparatus and method for data sensing circuitry that uses averaging to sense small differences in signal levels representing data states. The apparatus periodically switches the coupling of input terminals and output terminals of an integrator circuit from a first c... | 08/22/2006 |
| 7075445 | Rapidly responding, false detection immune alarm signal producing smoke detector A smoke detector of an obscuration type has an effective light propagation path of substantially greater length than the light propagation paths of conventional obscuration-type smoke detectors to provide increased smoke detection sensitivity without increased backg... | 07/11/2006 |
| 7009901 | System and method for sensing data stored in a resistive memory element using one bit of a digital count A method and system sense the logic state of an unknown initial data bit stored in a selected resistive memory cell. According to one method, a first count representing the logic state of the unknown initial data bit stored in the selected memory cell is generated. ... | 03/07/2006 |
| 6954390 | Noise resistant small signal sensing circuit for a memory device Apparatus and method for data sensing circuitry that uses averaging to sense small differences in signal levels representing data states. The apparatus periodically switches the coupling of input terminals and output terminals of an integrator circuit from a first c... | 10/11/2005 |
| 6954391 | Noise resistant small signal sensing circuit for a memory device Apparatus and method for data sensing circuitry that uses averaging to sense small differences in signal levels representing data states. The apparatus periodically switches the coupling of input terminals and output terminals of an integrator circuit from a first c... | 10/11/2005 |
| 6914674 | Weather identifier for snow, rain, and drizzle A weather identification system is provided which employs a first photosensitive receiver positioned directly in the path of a beam of light a predetermined distance from a partially coherent light beam source. The first photosensitive receiver is in direct optical ... | 07/05/2005 |
| 6843102 | Gas sensor arrangement A gas sensor configuration comprises a radiation-emitting radiation device, a gas measuring chamber, a detector unit and an evaluation device. A measuring gas that contains at least one gas component is present in the gas measuring chamber. The evaluation device det... | 01/18/2005 |
| 6359284 | Scanner type fluorescence detection apparatus An apparatus including a sample holder which fixedly holds sample vessels arranged on a same arc, a partition plate, a light guide which is configured by optical fibers and which transmits fluorescent signals emitted from respective test samples, to an op... | 03/19/2002 |
| 5506685 | Method and apparatus for determining the absorption of electromagnetic radiation by a gas The invention provides a method consisting successively in producing two electromagnetic radiations of the same wavelength that is modulated as a function of time over a range of wavelengths, a "measurement" one of said radiations passing through a gas th... | 04/09/1996 |
| 5400664 | Apparatus for observing the suction of a sample having an automatic regulation fuction In an automatic analyzer such as blood analyzer, it is important to observe whether the sample, such as a blood sample, is sucked correctly or not. In an apparatus for observing suction of a sample, comprising a sample suction tube, a luminous element for... | 03/28/1995 |
| 5294806 | Optical submicron aerosol particle detector A particle detector that determines the presence of particles in an enclosed volume includes a laser that directs an optical beam to a beam splitter that produces first and second beams. An optical system directs the first beam into the enclosed volume. A... | 03/15/1994 |
| 5237857 | Down-hole liquid detecting apparatus The probe (20) includes a conductivity sensor (38) and an optical sensor (39) for detecting the depth of a layer of oil, gasoline, etc floating on the surface of water in a well. A battery (60) is included in the probe, and a resistor (R1) is provided in ... | 08/24/1993 |
| 5206519 | Constituent concentration indicator with a differentiator means and a signal conditioning means The Rolling Average Rate Read Indicator and Method detects the presence of a particular constituent in either a solid, liquid or gas and returns a rapid and accurate measurement of the concentration of the constituent. The Indicator is comprised of a sens... | 04/27/1993 |
| 5156012 | Refrigerant charge detection system for an air conditioning system An air conditioning system having a circuit for determining whether sufficient refrigerant is present in the system by detecting a phase state of the refrigerant. The circuit comprises a comparison circuit for comparing a detection signal of a state detec... | 10/20/1992 |
| 5132096 | Monitoring performance of a water treating agent by measuring and resolving optical voltage analogs Analyzing the level of a treating agent and/or stress metals in a body of water containing an inert transition metal tracer added to the water proportionally with the treating agent by determining the absorbance (first absorbance value) of a reagent dye a... | 07/21/1992 |
| 5092677 | Photometer having a long lamp life, reduced warm-up period and resonant frequency mixing An apparatus and method for making a photometric determination regarding the contents of a sample, such as the absorbance characteristic of a blood serum sample. The improvement allows measurements to be taken after a reduced warm-up period and compensate... | 03/03/1992 |
| 5083036 | Indicator circuit for a concentration measuring apparatus An indicator circuit is provided for an apparatus that measures the concentration of a selected component in a test sample. The apparatus generates a test voltage that represents the concentration of the component in the test sample. The circuit generates... | 01/21/1992 |
| 5053623 | Photometric analyzer for differential total reduced sulfur measurement by comparison with sample gas A photometric analyzer for measuring differential total reduced sulfur in a sample gas stream is provided. It includes a supply for a sulfur bearing gas sample, an oven having an inlet connected to the supply for converting TRS to SO2 and an ou... | 10/01/1991 |
| 4908676 | Sensors for dissolved substances in fluids The present invention comprises a simple multi-purpose on-line system for monitoring the concentration and/or the total amount of an organic analyte species or inorganic analyte species in an aqueous solution. The on-line detection system comprises a dete... | 03/13/1990 |
| 4848904 | Dual beam multichannel spectrophotometer with a unique logarithmic data converter The present invention relates to an improved dual beam multichannel spectrophotomer employing a simple and novel optical system in combination with photodiode arrays and a unique logrithmic data converter to convert light signals to absorbance. In particu... | 07/18/1989 |
| 4759631 | System for transmission loss comparison A system for transmission loss comparison permits enhanced accuracy over a wider dynamic range by providing a reference channel including a transmitter, receiver, and transmission path therebetween, and a sample channel, including a transmitter, receiver,... | 07/26/1988 |
| 4757306 | Separation type light extinction smoke detector A separation type light blocking smoke detector detects smoke present between a light emitting section and a light receiving section spaced therefrom by detecting blocking of light between the light emitting section and the light receiving section. The de... | 07/12/1988 |
| 4707133 | Apparatus for plasma diagnostics A system for measuring the density of certain ions or neutrals within a plasma without probe intervention. When cylindrical symmetry is present, the system also provides measurement of spatial distribution of excited ionic states within the plasma. The sy... | 11/17/1987 |
| 4651013 | Smoke detector with changeable pulse light emitting interval for monitoring purposes A smoke detector comprising a light emitting section from which pulse light is radiated to a detection area with a predetermined period and a light receiving section which is disposed so as to be opposite to the light emitting section to receive the light... | 03/17/1987 |
| 4638304 | Environmental abnormality detecting apparatus An environmental abnormality detecting apparatus for detecting abnormality in atmosphere such as heat, smoke, and a gas. A sampling circuit is provided for periodically sampling analog signals from a detector for detecting these phenomena. A quantizer qua... | 01/20/1987 |
| 4637730 | Optical and electronically compared absorptiometer This invention relates to an optical absorptiometer which is characterized by a light source unit of a broad wavelength having a source of constant energy which is collimated into two light beams, one of which is transmitted through the liquid to be measu... | 01/20/1987 |
| 4586026 | Infrared gas analyzer using count quadrature sampling The percentage gas concentration within a sample as measured in a conventional optical bench is derived from the composite signal of the reference beam and sample beam transmitted through a sample cell in the optical bench. The primary source, which gener... | 04/29/1986 |
| 4579253 | Toner control system An improved toner control system having a pair of matched photosensitive devices connected in series and receiving equal amounts of light, wherein one device responds to light transmitted through the toner-containing developer and the other device respond... | 04/01/1986 |
| 4559453 | Smoke detector with a radiation source operated in a pulse-like or intermittent mode In a line extinction detector using a pulse-operated radiation source, a radiation receiver is connected to an input amplifier of an evaluation circuit. The output pulses generated by the input amplifier are compared to a reference voltage. Circuit elemen... | 12/17/1985 |
| 4555634 | Optical smoke detector with contamination detection circuitry A smoke detector is disclosed having a radiation source operated in a pulsed mode. Externally of a direct radiation region of the radiation source there is arranged a radiation receiver which, in the presence of smoke or other particles emanating from a c... | 11/26/1985 |
| 4547675 | Smoke detector operating according to the radiation extinction principle A smoke detector contains two radiation transmitters and two radiation receivers. Each of the radiation transmitters emits in a different spectral region, for instance, one emits above and the other one below 600 nm. One part of the radiation of both radi... | 10/15/1985 |
| 4537510 | Output control device for light detectors for photometers Apparatus for controlling output signals from two light detectors in a photometer. The sensitivities of the light detectors, or the gains in amplifiers for amplifying output signals from the light detectors are controlled in such a manner that the sensiti... | 08/27/1985 |
| 4525069 | Optical absorption analyzer An optical absorption analyzer for determining the concentration of low concentration components of a sample gas. Inexpensive voltage to frequency converters, up/down counters, and integrators are used to obtain a high accuracy determination which is inde... | 06/25/1985 |
