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3979669 |
Particle analyzing system
A particle analyzing system of the type having an aperture retaining member for obtaining signals from microscopic particles suspended in a fluid which passes through a scanning aperture. The...
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3975681 |
Electrode for measuring thickness of dielectric layers on conductive substrates
An electrode structure comprising a tube of substantially electrically insulating material such as glass, having a rounded tip of substantially electrically insulating material such as rubber,...
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3973196 |
Method and apparatus for ejecting a metered amount of particulate sample
A particle study device wherein a non-diluted specific minute amount of fluid sample containing particles is ejected by an ejecting mechanism into a flow stream leading to a sensing zone in the...
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3973194 |
Particle counter
A fluid containing disbursed particles is pumped through an aperture which has a pair of electrodes mounted on each side of said aperture. The pair of electrodes is excited by an rf signal which is...
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3970920 |
Measuring arrangement for an apparatus for electrostatic coating of grounded objects for measuring the ground resistence
A measuring arrangement for an apparatus for electrostatic coating of grounded objects for measuring the ground or earthing resistance thereof, and wherein the objects are moved past the apparatus....
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3970928 |
Electrical apparatus for the calibration of equipment used in the measurement of particle volume
Calibration apparatus for use with particle volume measuring equipment us the Coulter process, which detects and analyzes the voltage pulses produced by particles passing a narrow aperture in which...
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3964982 |
Method and apparatus for controlling the degree of hydration in sealing of anodized aluminum
A mixed potential measurement utilizing a strip chart recording voltmeter coupled between the metal and its oxide immersed in the sealing solution is determinative of percent hydration of the part...
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3963984 |
Method and system for cleaning an aperture in a particle study device
In both the method and system for clearing the debris from the aperture of a particle study device combinations of pulses of predetermined, waveform amplitude and frequency are developed and...
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3963983 |
Pulse amplitude discriminating circuit
The pulse amplitude discriminating circuit is utilized in a system where particles in a fluid are caused to flow through a sensing zone and a particle pulse is generated for each particle sensed...
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3961249 |
Particle size distribution analyzation employing trailing edge differentiation
A particle analyzer for obtaining a narrow distribution of particles suspended in a liquid wherein electric pulses are produced by moving the liquid through a sensing zone. The analyzer includes...
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3961248 |
Gas detector using gas sensing elements exhibiting different response characteristics
A gas detector comprises a plurality of semiconductor gas detector elements each exhibiting a different sensitivity for at least one gaseous conponent. The elements are electrically combined in an...
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3958177 |
Particle analyzing device with changeable aperture means
A particle analyzing device in which a suspension of particles in a fluid medium is passed through an aperture in a strip of plastic material, and the change in the conductivity of the suspension...
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3952418 |
Master gear for checking tooth contact
Master gear for checking tooth contact characterized by the fact that all or part of its contact surface is made of an insulating material and two sets of conductive detectors are regularly...
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3951161 |
Method of detecting the onset of formation of adherent precipitates on surfaces immersed in liquids, and controlling the formation of such precipitates
The method comprises employing electrical contact resistance to sense whether or not there is incipient precipitation of adherent scale, paraffin wax, etc., on surfaces immersed in various liquids....
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3944917 |
Electrical sensing circuitry for particle analyzing device
The electrical sensing circuitry includes a power supply and a signal-detecting circuit which are coupled through the resistance of an electrolyte in a liquid in an aperture of a particle-analyzing...
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3942101 |
Method for locating and evaluating geothermal sources of energy by sensing electrostatic voltage gradients
A method and apparatus for locating and evaluating geothermal sources of energy wherein it is known that the earth has electrical currents and that these currents are reflected in electrostatic...
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3939409 |
Particle study device and sample metering means used therein
A particle study device includes a sample metering device having an input for receiving a sample of particulate matter, a drain for expelling the sample of particulate matter, an ejection port, and...
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3936738 |
Method of and apparatus for measuring the amount of coating material applied to substrates
The conductivity and temperature of a coating material before application to a substrate are measured. The overall conductance and the elevated temperature of the coating material after application...
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3935053 |
Process for preparing thermosetting laminates
An improved method of laminating thermosetting laminates is provided which comprises heating a laminate assembly which comprises a thermosetting resin, measuring the electrical impedance of the...
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3932807 |
Gas sensitive devices
In a system for detecting a gas or vapour by virtue of its effect on the electrical conductivity of a semiconducting material which is maintained at a suitable operating temperature by an electric...
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3926337 |
Method of measuring concentration ratios of a mixture of materials
A method of measuring the ratio of carrier particles to toner particles in an electrostatic printing operation is disclosed herein. The method includes the employment of the electrical properties...
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3924180 |
Potential sensing cell analyzer
The disclosure relates to an apparatus and method for electrically analyzing biological cells. An orifice having two potential sensing electrodes is immersed in a container of saline solution in...
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3917451 |
Electrokinetic streaming current detection
An electrokinetic streaming system with an oscillating drive is employed for the rapid, accurate reproducible detection of the fixed charge density of a coating on the inner surface of a flow...
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3918035 |
Quantity level gauge
Indicating apparatus comprising a plurality of indicator lamps connected to respective outputs of a plurality of voltage comparators. The comparators have a first input connected to a common input...
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3915646 |
Method and means for quantitative analysis of sulfuric acid-containing gases
There is disclosed a method and means for the quantitative analysis of sulfuric acid contained as a vapor or aerosol in a sample gas. The sample gas is contacted with a water extractant having a...
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3914688 |
COLD SPOT DETECTOR FOR LNG TANKS AND TANKERS
A method and apparatus for detecting leaks or failures in the insulation of a cold storage container wherein electrically non-conducting conduits are placed in cold transfer relationship with the...
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RE28558 |
Self-cleaning aperture tube for coulter study apparatus
A two chamber aperture tube for obtaining signals from particles suspended in a fluid which passes through a scanning aperture. The suspension enters the primary bore provided in one chamber and...
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3906783 |
Instrument for detecting the plastic flow point of a metal
An instrument is provided for detecting the exact yield point of a sample at which plastic deformation and flow occurs as the stress is increased beyond the elastic limits of the material. The...
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3902115 |
Self-cleaning aperture tube for coulter study apparatus and electrolyte supply system therefor
A two chamber aperture tube for obtaining signals from particles suspended in a fluid which passes through a scanning aperture. The suspension enters an aperture in an inlet chamber and passes...
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3902053 |
Pre-set circuit for measuring a dividing particle size of a particulate system
A pre-set circuit in an apparatus for measuring a dividing particle size of a particulate system operates, prior to apparatus operation, to pre-set the apparatus to indicate a selected dividing...
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3896373 |
Method and apparatus for determining cross-sectional area of a blood conduit and volumetric flow therethrough
An improved method and apparatus for determining the cross-sectional area of a blood conduit or the like, as defined herein, and, in one form, the instantaneous and continuous volumetric flow...
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3890569 |
Particle study device
A particle study device wherein a non-diluted specific minute amount of fluid sample containing particles is ejected by an ejecting mechanism into a flow stream leading to a sensing zone in the...
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3888565 |
Electrochromic voltage indicator
An electrochromic BITE indicator for fault detection in integrated circuitry. The electrochromic structure utilizes an electrochromic paste cell concept and fits into a commercial TO--5 can/header...
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3882385 |
Method and apparatus for studying particles having widely different sizes
An apparatus for studying particles of widely different sizes includes a vessel and a fluid medium in the vessel with the particles suspended thereon. First and second aperture tubes are suspended...
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3882384 |
Energy conversion
Apparatus for measuring temperature or light intensity is disclosed. Potential pulses of variable frequency are impressed between the collector and emitter of a transistor whose base is open or...
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3868315 |
Electronic measurement of end point of asphalt oxidation
An electronic measuring technique for use in determining the end point of a process, such as an air blowing process employed in the manufacture of asphalt, by means of an electronic bridge circuit,...
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3864676 |
Moisture detector
An elongated sensor is longitudinally crimped to provide electrical isolation between two closely spaced wire conductors and to form around each conductor a surrounding elongated tube of porous...
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3864083 |
Carbon Detection
A method for continuously detecting carbon deposition in a catalyst bed. Hence, processes involving reactions of carbonaceous materials can be controlled with reference to carbon deposited, thereby...
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3864628 |
SELECTIVE SOLID-STATE GAS SENSORS AND METHOD
A method for detecting gases by selectively moving a gas through a gas permeable membrane to a semiconductor sensor which qualitatively reports such gas as an electrical output after a...
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3857093 |
VEHICLE LOAD MEASURING USING A SHOCK ABSORBER AND VARIABLE RESISTOR
The present invention comprises a method and means for measuring the load applied to a given axle of a vehicle, the vehicle having a frame and spring means yieldably supporting the frame with...
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3857095 |
METHOD AND APPARATUS FOR MEASURING THE THICKNESS OF A COATING ON A SUBSTRATE
The thickness of a coating, such as an ink film, on a substrate, such as a printing surface, is determined by supporting a transducer on a cushion of gas at a constant distance from the surface of...
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3854088 |
COUNTING AND ANALYSIS APPARATUS FOR PARTICLES SUSPENDED IN AN ELECTROLYTIC LIQUID
A counting- and analysis apparatus for particles suspended in an electrolytic liquid, wherein the suspension flows through a bore having a predetermined diameter and functioning as an electrical...
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3852914 |
METHOD FOR DETERMINING THE VIABILITY OF SEEDS PRIOR TO GERMINATION
The process of determining the viability of seeds by means of non-destructive testing and prior to germination wherein seeds from the dry storage state are moistened to cause them to pass into at...
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3852666 |
METHOD AND APPARATUS FOR COMPENSATION OF THE TEMPERATURE-DEPENDENCY OF THE CONDUCTIVITY OF A FLUID WITH SUSPENDED PARTICLES
A method of, and apparatus for, the compensation of the temperature-dependency of the conductivity of an electrically conductive liquid during pulse amplitude measurement of particles suspended in...
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3851641 |
METHOD AND APPARATUS FOR DETERMINING INTERNAL IMPEDANCE OF ANIMAL BODY PART
Apparatus and a method for determining the internal impedance of a portion of an animal body. Two electrical currents of different frequencies are passed through the body portion and the voltage...
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3851246 |
METHOD OF PREDICTING THE POST TRANSFUSION VIABILITY OF PRESERVED ERYTHROCYTES AND OTHER SIMILAR CELLS
A method is provided for determining the quality or post transfusion viability of preserved human red cells, marrow cells, and other body cells having similar characteristics which comprises...
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3844940 |
SYSTEM FOR MEASURING ULTRAFILTRATION RATE
A system for measuring the rate of ultrafiltration through a semipermeable membrane of a first fluid flowing across one surface of said membrane at a first pressure into a conductive second fluid...
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3842345 |
METHOD AND APPARATUS FOR OBTAINING ACCURATE READOUT OF BREATH TESTERS
An improved readout apparatus and method for use with a testing system such as that shown in U.S. Pat. application Ser. No. 136,778, now Pat. No. 3,764,270 is disclosed employing a holding...
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3838337 |
PULSE UTILIZATION INDICATION CIRCUIT
A circuit for indicating the percentage utilization of pulses being applied to a utilization device which includes means for sensing the voltage levels which occur during pulse utilization and...
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3836850 |
APPARATUS FOR PARTICLE SIZE DISTRIBUTION DISPLAY WITH MEANS TO SELECTIVELY ALTER THE DISPLAY BY ADDING PREDETERMINED D.C. SIGNALS TO THE DATA
The system includes a plurality of potentiometers and summing networks and a switching mechanism for alternately connecting the potentiometers to a neutral position, to a negative voltage source or...
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