Did You Know...
...that the Eveready Battery began as an invention called the "electric flowerpot," which was a tube with a battery and light bulb inside? The idea was to fasten this gizmo to the side of a flowerpot so it would illuminate the flowers from the bottom. The idea died on the vine and the businessman who licensed the flower pot, Conrad Huber, was left with a pile of useless tubes -- until he found a way to market them as batteries to light the world!
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| Number | Title | Issue Date |
| 8163182 | Compartmentalized field flow fractionation A field flow fractionator to separate particles contained within an injected sample aliquot is described. As required, said fractionator may be used to capture, for subsequent removal, specific predefined classes of such particles. Based upon the cross flow or asymm... | 04/24/2012 |
| 7982875 | Method and apparatus for measuring the scattered light signals from a liquid sample A sample cell for making light scattering measurements, incorporating an exterior surface acting as both a lateral and vertical lens, is described. This unique structure permits greatly improved measurement of the light scattered by molecules and particles suspended... | 07/19/2011 |
| 7911594 | Method to derive physical properties of a sample after correcting the effects of interdetector band broadening Chromatographic separations are often characterized by multiple detectors through which the sample flows serially. As the sample flows between detectors, it becomes progressively diluted due to mixing and diffusion. This phenomenon is traditionally called interdetec... | 03/22/2011 |
| 7813882 | Method for determining average properties of molecules in solution A new method is presented for measuring the molecular properties of an unfractionated solution of macromolecules. Sample aliquots spanning a range of concentrations are injected sequentially into a stream of solution and flow towards the detectors. Each aliquot prod... | 10/12/2010 |
| 7386427 | Method for correcting the effects of interdetector band broadening Chromatographic separations are often characterized by multiple detectors through which the sample flows serially. As the sample flows between detectors, it becomes progressively diluted due to mixing and diffusion. This phenomenon is traditionally called interdetec... | 06/10/2008 |
| 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 |
| 7283221 | Refractometer cell for both absolute and differential refractive index measurement of fluids An improved cell for a walk-off refractometer is disclosed that permits measurement of the differential refractive index, DRI, between a sample fluid and a reference fluid. In addition, the new cell design permits the measurement of the refractive index, RI, of a fl... | 10/16/2007 |
| 7027138 | Enhanced sensitivity differential refractometer incorporating a photodetector array An improved differential refractometer incorporating a photodetector array is disclosed. Using a multi-element photo array provides the basis for measurement of differential refractive index values with a heretofore unattainable combination of sensitivity of measure... | 04/11/2006 |
| 6975392 | Enhanced sensitivity differential refractometer measurement cell A sensitivity-enhanced flow cell to be used in the determination of the differential refractive index increment of a sample fluid relative to a reference fluid is disclosed. The invention permits the use of smaller sample amounts without sacrificing overall sensitiv... | 12/13/2005 |
| 6778912 | Device and method to locate, detect, and remove precipitated aerosol particles A method and apparatus are described by which previously identified aerosol particles that may have precipitated onto surfaces and/or into specific physical regions are detected, removed from said regions, and stored for later examination or destruction. The method ... | 08/17/2004 |
| 6774994 | Method and apparatus for determining absolute number densities of particles in suspension A method for determining absolute number densities of particles in a solution is disclosed based on a light scattering method. A light scattering photometer is calibrated to produce the Rayleigh ratio at each angle measured with respect to light scattered per unit i... | 08/10/2004 |
| 6651009 | Method for determining average solution properties of macromolecules by the injection method A new method is presented for measuring the molecular properties of an unfractionated solution of macromolecules. Sharing some similarities with the standard Zimm plot technique, the method begins with the preparation of several sample aliquots spanning a... | 11/18/2003 |
| 6490530 | Aerosol hazard characterization and early warning network An aerosol hazard classification and early warning network is composed of a large number of detector and analysis units, called "detector stations," which are deployed throughout a region to be warned of a potentially hazardous aerosol intrusion. Such aer... | 12/03/2002 |
| 6452672 | Self cleaning optical flow cell Optical flow cells used, for example, for making scattered light measurements on liquid borne samples, are often affected by particulate materials that adhere to the internal optical surfaces. These contaminating particulates can cause distortions of the ... | 09/17/2002 |
| 6426794 | Optical flow cell incorporating automatic self-cleaning Optical flow cells used, for example, for making scattered light measurements on liquid borne samples, are often affected by particulate materials that adhere to the internal optical surfaces. These contaminating particulates can cause distortions of the ... | 07/30/2002 |
| 6411383 | Method for measuring the 2nd virial coefficient A method is described to determine the 2nd virial coefficient of an ensemble of molecules dissolved in a selected solvent. Two distinct classes are described: monodisperse and polydisperse molecules. If the molecules are monodisperse, they must... | 06/25/2002 |
| 6180906 | Electrode design for electrical field flow fractionation An improved channel for separation of molecular and particulate samples by means of electrical field flow fractionation (FFF) is disclosed. The electrodes therein are made of metal oxide coated flat glass plates and permit the achievement, thereby, all of... | 01/30/2001 |
| 6128080 | Extended range interferometric refractometer A method and apparatus is disclosed for measuring the refractive index difference between a reference and sample liquid based on an interferometric design. The resultant device has an almost unlimited range of operation in contrast to a conventional inter... | 10/03/2000 |
| 5900152 | Apparatus to reduce inhomogeneities in optical flow cells A capillary tube used to transfer a liquid sample into a detection cell following separation by a chromatographic system is modified by plugging or otherwise severely restricting its flow. Near its plugged end, said tube is drilled to provide a plurality ... | 05/04/1999 |
| 5676830 | Method and apparatus for reducing band broadening in chromatographic detectors A capillary tube used to transfer a liquid sample into a detection cell following separation by a chromatographic system is modified by plugging or otherwise severely restricting its flow. Near its plugged end, said tube is drilled to provide a plurality ... | 10/14/1997 |
| 5530540 | Light scattering measurement cell for very small volumes A modified light scattering cell, and associated method, whereby an eluant of very small dimension transverse to its direction of flow is entrained successively by two sheath flows and presented to a fine light beam that illuminates the entrained eluant a... | 06/25/1996 |
| 5528366 | Precision determination for molecular weights This invention describes a method by which the precision of the reported molecular weights and radii of chromatographically separated molecules may be estimated. By suitably analyzing both the baseline and peak regions of a chromatogram, one may determine... | 06/18/1996 |
| 5475235 | Control of laser light power output for use in light scattering instruments by inducing mode hopping and averaging result The incorporation of certain classes of solid state lasers into light scattering instrumentation is desirable because of their compact structure. However, mode hopping often causes the output power produced by such lasers to be unstable. The frequency of ... | 12/12/1995 |
| 5129723 | High performance Zimm chromatography--HPZC A method is disclosed based on a single injection into a modified HPLC line by which means the light scattering data required to characterize the injected molecular suspension in terms of its weight-average molecular weight, z-average square radius, and s... | 07/14/1992 |
| 4952055 | Differential refractometer A differential refractometer is described capable of measuring the refractive index charge, dn, of a transparent fluid corresponding to a change dc of the concentration of a solute in said fluid. The fluid is restricted to a fine capillary within a transp... | 08/28/1990 |
| 4907884 | Sample cell monitoring system The light intensity incident on a scattering sample contained in a scattering cell is monitored by simultaneous measurements of the light incident on the cell before entering it and the light transmitted through the cell after leaving it. Means to monitor... | 03/13/1990 |
| 4810875 | Method and apparatus for examining the interior of semi-opaque objects A highly collimated light beam, such as produced by a laser, is coupled by optical means directly onto a semi-opaque object such as a human breast. The light transmitted and scattered therein is collected at a fixed surface element and direction relative ... | 03/07/1989 |
| 4710025 | Process for characterizing suspensions of small particles An apparatus and process are described for the characterization and/or identification of suspensions of microparticles based upon the measurement of certain optical observables produced as the suspension is illuminated by a beam of light, or other electro... | 12/01/1987 |
| 4693602 | Method and apparatus for measuring the light scattering properties of small particles The measurement of the scattering properties of very small particles by electro-optical means generally requires the use of an intense, though highly spatially inhomogeneous, light source such as a laser. Many instruments require, therefore, that the inte... | 09/15/1987 |
