Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 8142722 | Test element and tester for analyzing solutions An apparatus for analyzing an aqueous solution, as may be implemented with a hand-held portable electronic device (10) and test element (16). A test pad (32) of the test element responsive in color to a characteristic of an aqueous solution is i... | 03/27/2012 |
| 8065906 | Detection of free chlorine in water The present invention describes methods and kits for determining the concentration of free chlorine in water. To avoid false readings from other species present in the water, the free chlorine is reacted with ammonia to form monochloramine, which is then reacted to ... | 11/29/2011 |
| 7789552 | Particulate tester with mixer for analytical application A mixer for analytical application mixes a container of fluid without a magnetic stir bar. A device for testing a liquid for particles can use the mixer. The mixing can occur in a sealed container, and liquid can be transmitted to the device from the sealed containe... | 09/07/2010 |
| 7698073 | Anti-terrorism water quality monitoring system An Anti-Terrorism water quality monitoring system for continuously monitoring a potable water treatment system and related potable water distribution network that provides potable water to a municipality, city, housing development or other potable water consumer. Th... | 04/13/2010 |
| 7658826 | Reference electrode A reference electrode including a water-impermeable, non-conductive substrate having a surface; an electrically conductive metal/metal salt mixture layer in contact with the surface; a water-soluble alkali metal salt layer; and a water-impermeable barrier layer over... | 02/09/2010 |
| D596926 | Standard holder and standard for insitu turbidity measurement device | 07/28/2009 |
| 7538874 | Measurement of light from a predefined scatter angle from particulate matter in a media A measurement system that can measure scattered light across a predetermined scatter angle is disclosed. The measurement system has a light source configured to provide light along a first axis. The measurement system has a lens system aligned along a second axis th... | 05/26/2009 |
| 7528951 | Optical design of a measurement system having multiple sensor or multiple light source paths A measurement system that has multiple sensors or multiple light sources is disclosed. The measurement system comprising a light source directed along a first axis and configured to illuminate a sample volume. The measurement system has a first sensor aligned along ... | 05/05/2009 |
| 7525655 | Optical design of a particulate measurement system The optical design of a measurement system is disclosed. The measurement system comprising a light source configured to provide light along a first axis. The measurement system has a reflecting lens aligned along a second axis where the reflecting lens has a first f... | 04/28/2009 |
| 7505132 | Self calibrating measurement system A measurement system that can self calibrate is disclosed. The measurement system comprising a first light source directed along a first axis and configured to illuminate a sample volume. The measurement system has a sensor aligned along a second axis and is configu... | 03/17/2009 |
| 7495763 | Dual function measurement system A measurement system having dual measurements capabilities is disclosed. The measurement system has a light source configured to provide light along a first axis that illuminates a sample media. The measurement system has a first sensor configured to measure scatter... | 02/24/2009 |
| 7438796 | Electrochemical chlorine sensor A sensor for measurement of free chlorine and of total chlorine in aqueous solution including a working electrode having a self-assembled monolayer (SAM) formed on the surface thereof, producing a barrier which reduces the generation of background currents when elec... | 10/21/2008 |
| D570718 | Portable hand-held test instrument | 06/10/2008 |
| 7342506 | Wireless remote monitoring system A remote monitoring system is described which enables monitoring of flow meters or other scientific instruments from a remote location using the GSM cellular phone network. The system includes a wireless modem utilizing the GSM cellular phone network, a central proc... | 03/11/2008 |
| 7121158 | Sensor insertion into an active conduit A method and apparatuses for installing a sensor on an active conduit is disclosed. An adaptor is attached to a corporation stop valve that has been installed onto an active conduit in the closed position. A sensor is positioned at a first position in the adaptor fo... | 10/17/2006 |
| 7033839 | Quick acting toxic ammonia test for aqueous samples A method, test reagent and device usable as a test strip for detecting toxic ammonia levels in water samples such as aquarium water. The volume of the water to be tested contacted with a soda lime reagent to raise the pH to at least 10, and simultaneously contacted ... | 04/25/2006 |
| 6999898 | Classification of deviations in a process A process analysis system includes sensors and a processing system. The sensors monitor the process to generate sensor signals. The processing system processes the sensor signals to detect a deviation from a baseline for the process. The processing system generates ... | 02/14/2006 |
| D514532 | Wireless remote monitor enclosure | 02/07/2006 |
| 6912050 | Phase shift measurement for luminescent light A phase shift measurement system comprises an excitation system, a luminescent material, and a detection system. The excitation system transfers an excitation light wave. The luminescent material transfers a luminescent light wave in response to the excitation light... | 06/28/2005 |
| 6894778 | Low detection limit turbidimeter A turbidimeter having an arrangement of internal surfaces, optical surfaces, and optical restrictions to the field of view of both the illumination and the detector means to significantly improve the lower detection limit of the turbidimeter by reducing the detected... | 05/17/2005 |
| 6844934 | Optical turbidimeter with a lens tube An apparatus for measuring tubidity of a liquid has a tubular lens of transparent material with an aperture for receiving the liquid. First and second first light emitters are positioned adjacent the tubular lens to produce two beams of light each diverging at a pre... | 01/18/2005 |
| 6793889 | Wide-range TOC instrument using plasma oxidation Total organic carbon in an aqueous or gaseous sample is measured by admitting the sample and an oxidant gas to a cell transparent to plasma, establishing a relatively low energy plasma in the cell, and measuring the CO2 thus produced using FTIR, NDIR, or ... | 09/21/2004 |
| D488081 | Pocket colorimeter | 04/06/2004 |
| 6682937 | Threshold glucose detection in urine Methods are provided for glucose detection and quantification in urine. The methods include selecting a test device comprising a matrix impregnated with a chromogenic indicator mixture, locating the test device to promote incidental contact of same with a... | 01/27/2004 |
| 6628394 | Optical gasket system An optical gasket system for use in a colorimeter or other instrument which utilizes a light beam and a sample cell or chamber for a liquid to be tested. Each gasket is optically clear and is pliable so as to conform to the surface of the sample cell whic... | 09/30/2003 |
| 6576143 | Method for the removal of sulfide interference in common tests for arsenic A method for removing sulfide from a liquid sample such as water in a test for arsenic. The method involves adding a strong oxidizing agent to the sample to oxidize the sulfide to sulfate, and then adding an organic amine to the sample to react with any r... | 06/10/2003 |
| 6538736 | Concentric spectrometer with mitigation of internal specular reflections Concentric spectrometers are plagued with internal reflections due to inherent nature of more than one optical surface possessing a common center of curvature. Reflections from optical surfaces arise when there is a difference or change in the refractive ... | 03/25/2003 |
| 6533234 | Self-centering system A self-centering system is described for holding an object (e.g. a vial, tube or cell) to maintain the longitudinal axis of the object in the desired orientation. The system includes two cam members which are pivotably mounted on parallel axes. The cam me... | 03/18/2003 |
| 6512178 | Sliding cover system An instrument housing is described having an arcuate upper surface and a sliding cover which rests on the upper surface of the instrument. The cover slides between open and closed positions. The cover includes a base with an elongated slot, and the upper ... | 01/28/2003 |
| 6368870 | Controlled diffusion analysis A method is described for determining the presence of a volatile component in a test sample. The method involves use of two separate vessels, one of which is capable of being placed wholly within the other vessel. The test sample is placed in the larger v... | 04/09/2002 |
| 6315950 | Controlling chlorination of wastewater and chloramination of drinking water A method is described for precisely controlling chlorination of wastewater and chloramination of drinking water. The method involves analyzing the water for the presence of residual monochloramine without interference of dichloramine, organic amines, orga... | 11/13/2001 |
| 6307630 | Turbidimeter array system A turbidimeter array system is described in which a common light source and a common detector are used in conjunction with a plurality of test sample chambers for measuring the turbidity of a sample in each of the numerous chambers sequentially. Many embo... | 10/23/2001 |
| 6180412 | Test for chlorine in water An improved test is described for chlorine in pool and spa water where potassium monopersulfate is used as an oxidizing agent and DPD is used as an indicator. N,N-bis(hydroxyethyl)-2-aminoethane sulfonic acid or bicine is used to mask or eliminate the pot... | 01/30/2001 |
| 5932174 | Device for chloride ion removal prior to chemical oxygen demand analysis A method of pretreating aqueous chemical oxygen demand (COD) samples to remove the risk of potential chloride ion interference. The method comprises acidifying an aqueous COD test sample, and thereafter passing the acidified sample through a source of pen... | 08/03/1999 |
| 5912737 | System for verifying the calibration of a turbidimeter A system is described for verifying the calibration of a turbidimeter having a light source and a detector for scattered light. A first polarizer is positioned in the path of the light beam, and a second polarizer is positioned between the first polarizer... | 06/15/1999 |
| 5872361 | Turbidimeter with non-imaging optical concentrator A turbidimeter is described for measuring the turbidity of a liquid. The turbidimeter includes (a) a sample cell for the liquid to be tested, (b) an optical source such as a light-emitting diode (LED) for producing a light beam directed at the sample cell... | 02/16/1999 |
| 5864396 | Color comparator system A color comparator system is described which avoids the use of liquid reference standards and glass vials. In a preferred embodiment the system includes (a) a clear lens piece including a plurality of lens sections equal to the desired number of color ste... | 01/26/1999 |
| 5849592 | Carrierless sequential injection analysis A carrierless method is described for the analysis of a fluid sample for determination of the presence of a chemical species in the sample or for the determination of a physical characteristic of the sample. A portion of sample is drawn into a holding coi... | 12/15/1998 |
| 5831727 | Bubble elimination from liquid Apparatus and a method are described for eliminating gas bubbles from a moving liquid stream. The apparatus includes a plurality of chambers having an open top. Each chamber directs the moving liquid stream upwardly through an area of reduced diameter and... | 11/03/1998 |
| 5777011 | Stabilized formazin composition Stabilized formazin compositions suitable as turbidity standards. The compositions can be prepared by diluting a concentrated formazin composition with a diluent containing hexamethylenetetramine and, optionally, a water-soluble sulfate salt such as sodiu... | 07/07/1998 |
