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Inventor:
Davis; James E.
Address:
Wilmington, DE
No. of patents:
20
Patents:












Patent Number Title Of Patent Date Issued
7561271 Source adjusted colorimeter July 14, 2009
A low cost calorimeter wherein a linear taper potentiometer proportions the current through sample and reference solid state light sources in a near logarithmic fashion. The position of the potentiometer slider is proportional to the absorbance of the solution in the sample path when
6923147 Animal control system August 2, 2005
An animal control system generates an on-off correction stimulus using a small transformer and rectifies the high voltage output to give an unfiltered unipolar voltage applied to electrodes as a correction stimulus. A small, efficient power isolation system. A programming signal can
6690767 Prototile motif for anti-scatter grids February 10, 2004
A shielding grid constructed of a radiation absorbing material for use with an array of discreet, non contiguous radiation sensors to protect such sensors from scattered radiation. The sensors each have a radiation sensitive area with a width and a length. In designing the grid a pro
6684820 Animal control system February 3, 2004
An animal control system and method generates an on-off correction stimulus using a small transformer and rectifies the high voltage output to give an unfiltered unipolar voltage applied to electrodes as a correction stimulus. A small, efficient power isolation system is disclosed. An
6366643 Anti scatter radiation grid for a detector having discreet sensing elements April 2, 2002
A shielding grid constructed of a radiation absorbing material for use with an array of discreet, non contiguous radiation sensors to protect such sensors from scattered radiation. The sensors each have a radiation sensitive area with a width and a length. In designing the grid a pro
6194727 Direct radiographic imaging panel having a dielectric layer with an adjusted time constant February 27, 2001
A panel for radiation detection having a plurality of sensors arrayed thereon. Each sensor includes a charge storage capacitor, a radiation sensitive layer over the charge storage capacitor and a dielectric layer over the radiation sensitive layer. The dielectric layer has an adjusted
5827757 Fabrication of large area x-ray image capturing element October 27, 1998
A large imaging panel useful for direct radiography is prepared from two or four discrete modules, or tiles, containing arrays of solid state pixels. In preparing the large panels, a protective layer is applied over the array of solid state pixels on each module to protect the modules du
5606936 Animal restraining system March 4, 1997
A low average power animal restraining system and method has a radio frequency transmitter for generating a carrier signal, an antenna for radiating the carrier signa, a radio frequency receiver, adapted to be placed on the animal. The receiver has an animal stimulation mechanism for
5575242 Animal control system November 19, 1996
There is described a system for controlling the movement of an animal relative to a controlled area delineated by a wire loop antenna. The controlled area may be inclusive or exclusionary. A frequency modulated signal is transmitted by the FM transmitter connected to the loop. An FM
5397699 Method for stabilizing an alkanol amine buffer used in optical determinations of enzyme activity March 14, 1995
A method for stabilizing an alkanol amine buffer against substantial degradation so that enzyme activity can be optically determined in such a buffer is described. Stabilization is achieved by adding a stabilizing effective amount of a stabilizing agent to the buffer wherein the stab
5300423 Specific binding assay involving separation of light emissions April 5, 1994
This invention uses the evanescent wave detection of particles to distinguish bound from free in an analyte-binding assay. Illumination below the critical angle is employed, and a beveled window is used to eliminate bulk fluorescence from the emitted evanescent wave liquid. The sampl
5265482 Method of sampling a container November 30, 1993
A container is scanned bottom-to-top and top-to-bottom with a capacitive sensor to detect liquid interfaces therein. The interfaces are coded, have their height stored and have their codes compared to determine the internal consistency. If consistent, the code and height information is
5192510 Apparatus for performing fluorescent assays which separates bulk and evanescent fluorescence March 9, 1993
This invention uses the evanescent wave detection of particles to distinguish bound from free in an analyte-binding assay. Illumination below the critical angle is employed, and a beveled window is used to eliminate bulk fluorescence from the emitted evanescent wave liquid. The sampl
5147529 Method for automatically processing magnetic solid phase reagents September 15, 1992
Magnetic particles used as a solid support are placed in reaction vessels and stepped sequentially past successive magnets for separation.
5119316 Method for determining DNA sequences June 2, 1992
The method of this invention obtains the underlying peak shapes of two signal spectrums whose ratios are representative of different species. The underlying peak shapes are fitted to the signal spectrums in a way that yield accurate ratios. The ratios are accurate even when the location
5083470 Capacitive liquid level sensor January 28, 1992
A capacitance liquid level sensor uses an inductance to isolate the probe of the sensor from the plastic tubing coupled to the probe thus reducing false signals generated by movement of the tubing.
5012683 Capacitive liquid interface sensor May 7, 1991
A capacitive sensor is described having an element which traverses the outside of a container of liquid to ascertain the vertical locations of liquid interfaces in the container. The sensor uses an oscillator whose amplitude or phase is a function of the capacitance of the element.
4977786 Capacitive liquid level sensor December 18, 1990
A capacitance liquid level sensor uses an oscillator and sweeps the oscillator frequency at an ultrasonic rate thereby spreading the frequency spectrum and reducing interference from external radio transmitters and interference to local radio receivers.
4910406 Method for detecting the presence of contaminants in a reusable plastic food or beverage contain March 20, 1990
This invention relates to a method for detecting whether contaminants are on or have migrated into the body of a plastic reusable food or beverage container. The invention uses a sensor attached to the inside of the container which changes optical density when it is exposed to certain
4574850 Method of and apparatus for dispensing liquid March 11, 1986
A liquid pipetting system for aspirating and dispensing small samples of fluid and diluents. The pipetting system consists of a coaxial needle serving as the pipette tip and a metering system to control the fluids. Precise dispensing of small amounts of liquid from the inner needle is










 
 
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