Abstract: An image recording medium for recording incident radiation to provide a positive transparency is constructed of two electrically conductive composite layers containing photoconductive material between them. One of the conductive layers is opaque and the other is transparent to the incident radiation. A voltage, sufficient to cause holes to be produced in the opaque conductive layer in response to the incident radiation, is applied between the conductive layers. Various systems for controlling the recording process are described.
Abstract: A real-time multiplier capable of providing any desired number of the most significant product digits is described. The multiplier and multiplicand are provided concurrently to the multiplier as serial digital numbers. The least significant product digit is provided as the first digit of the serial digits of the product. Undesired less significant product digits are suppressed within the multiplier and do not appear as product digits, thereby allowing the successive operands to be provided to the multiplier without the waiting period between operands which would otherwise be required to allow all product digits to be read out of the multiplier from the previous multiplication. The number of stages in the multiplier is equal to the maximum number of digits in the operand.
Abstract: A variable speed electronic motor having wound polyphase armature and field windings each of which is energized by a polyphase source whose voltage and frequency are variable in a controlled fashion. Provision is made to control the excitation of the armature and field windings so that the torque output is optimized for all loads and speeds. Also, the machine disclosed can be made to function in a generating mode; hence, there can be flow of both electrical and mechanical energy to and from the machine and the amount of each can be carefully regulated. In addition, a variation of the machine, acting purely in a generating mode, can be programmed to regulate electrical output of the machine independent of the angular velocity of the machine, and output power can be similarly regulated, all within reasonable limits. Also, for some requirements one winding can be energized at a constant frequency and voltage and the other can be excited at variable frequency and voltage.
Abstract: Thick, finely-grained films of cermets are fabricated using conventional techniques of sputtering the ceramic and the metal onto a substrate. The cermet is then subjected to differential sputtering in which the metal is sputtered away faster than the ceramic to leave a ceramic-rich surface layer having excellent secondary-electron-emission properties for low-energy incident electrons. Typical of such cermets are MgO/Au, MgO/Pt and MgO/Ag. The presence of metallic particles in the bulk of the films and the small size of the ceramic particles greatly reduce surface charging while allowing the emitter film to be made thick enough to have a long operating life under adverse device conditions.
Abstract: Apparatus for effecting the function conventionally performed by the distributor plate in static, packed, or fluidized beds wherein the bed particles are supported or stabilized by an electric field imposed by an external source of electric potential.
Abstract: Analgesia is produced or hyperalgesia is reduced in an animal including human beings by administering 3-(p-trifluoromethylphenoxy)-N-methyl-3-phenylpropylamine either along or with morphine sulfate. A novel composition is provided comprising 3-(p-trifluoromethylphenoxy)-N-methyl-3-phenylpropylamine and 25 to 50 weight percent morphine sulfate based upon the weight of the phenylpropylamine.
Abstract: An electronic game wherein an electronic controller, connected to introduce RF signals through the antenna circuit of a television receiver, introduces to the receiver electric signals that produce on the screen thereof the simulation of at least part of a playing area and the simulation of active parts or components of a game.
December 11, 1975
Date of Patent:
July 12, 1977
Massachusetts Institute of Technology
Glen R. Dash, David J. Agans, Gabor L. Szakacs
Abstract: A cathode ray tube (CRT) having a faceplate-deposited cathodochromic material, said CRT having electron beam write and erase. The erase beam is an electron beam focused to a size of approximately 0.010 inches at the image screen of the CRT and the intensity of the beam is about 10.sup.5 watts/in.sup.2.
Abstract: Lead connections and packaging for integrated circuits are formed by processing elongated ribbon arrays of integrated circuit dice in groups prior to cutting the ribbon along its length to free the discrete integrated circuit products. The ribbon is adhered to the base of an elongated channel having at least one leg containing implanted lead-in conductors arranged therein as an axial series of axial arrays of conductors. The axial arrays are aligned with the circuits on the ribbons and interconnections therebetween are formed as photolithographically defined conductive coatings on a top surface of the ribbon extending from bonding pads of the integrated circuit to exposed conductor ends at a top end(s) of the leg(s). The channel ribbon assembly is cut into discrete circuits after forming such interconnections for all the circuits of the ribbon as a group.
Abstract: A discharge device for igniting a fuel-air mixture whereby fuel droplets in the mixture are electrically charged and, under the influence of an electric field, caused to congregate at a region thereby concentrating the mixture at said region, means being provided to create an arc at said region. A device of more general use is also disclosed.
Abstract: The isotopes of a gas are separated by using a circularly polarized laser to excite a lower energy level to higher split intermediate energy levels, a second laser pulse of the same circular polarization is applied to said energized gas at a time .pi./.DELTA..omega. where .pi..DELTA. is the frequency splitting of the intermediate levels, to excite said excited intermediate levels to a higher energy level where an ionizing field ionizes the atoms or molecules in the higher level so that they may be separated from the un-ionized atoms or molecules of the other isotope.
Abstract: A continuously programmable matched filter device using a piezoelectric substrate capable of propagating acoustic wave signals on a selected surface thereof and a semiconductor substrate mounted adjacent and spaced from such surface. Means are provided for altering the conductivity pattern in the semiconductor substrate in accordance with the wave form of a reference wave signal so that a representation of the reference wave is effectively stored therein. Storage of the reference is achieved with electrostatic charge by supplying a plurality of electrons in the spatial region between the substrates or by manipulating the carriers in the semiconductor material into trapping states in order to produce such altered conductivity pattern. A second signal can thereupon be propagated along the piezoelectric substrate to interact with the stored reference conductivity pattern to provide either correlation or convolution operation depending on the direction of propagation thereof along the piezoelectric surface.
Abstract: A method is disclosed for serially culturing keratinocytes such as human epidermal cells and teratomal keratinocytes. These can be serially grown in culture to produce colonies and eventually stratified squamous epithelium by including in the culture fibroblast cells or medium harvested from fibroblast cultures. When fibroblast cells are used, they are treated to prevent their multiplication, and they are also introduced into the cultures at a controlled density.
Abstract: A semiconductor sensor adapted to detect with a high degree of sensitivity small magnitudes of a mechanical force, presence of traces of a gas or light. The sensor includes a high energy gap (i.e., .about. 1.0 electron volts) semiconductor wafer. Mechanical force is measured by employing a non-centrosymmetric material for the semiconductor. Distortion of the semiconductor by the force creates a contact potential difference (cpd) at the semiconductor surface, and this cpd is determined to give a measure of the force. When such a semiconductor is subjected to illumination with an energy less than the energy gap of the semiconductors, such illumination also creates a cpd at the surface. Detection of this cpd is employed to sense the illumination itself or, in a variation of the system, to detect a gas.
Abstract: An electrical insulator composed of one or more electrical insulating skirts or sheds or shells; at least some of which skirts or sheds or shells have embedded therein or otherwise associated therewith a permanent magnet (usually annular in shape) that serves to create a magnetic field region through which an arc, in the event of incipient flashover, must pass as it proceeds radially from one terminal of the insulator to the other terminal thereof. The magnetic field is oriented to have a component at the surface of the insulator, that is orthogonal to said surface. As the arc passes through the field region it is deflected sideways or circumferentially and rotates in a circle, thereby dissipating the energy in the arc. The effect of the field can be increased by having two or more annularly shaped permanent magnets embedded in the insulator and spaced radially from one another, successive magnets having oppositely directed fields to the magnet or magnets immediately adjacent the same.
Abstract: A frequency locked loop that provides an output voltage waveform locked in frequency with an input voltage waveform. The output waveform is provided by a voltage controlled oscillator that is resettable to permit adjustment of the frequency of its output waveform.
Abstract: A gas, vapor or aerosol substance is ionized for mass spectral analysis by passing the substance through a chemical ionization zone in the presence of (a) charge exchange reactant gas or hydrogen and (b) a chemical ionization reactants' gas. The ionized substance can be passed directly to a mass spectrometer or through an electron impact ionization zone and then to the mass spectrometer.
Abstract: An isolated clonal cell line derived from the mouse fibroblast 3T3 line is disclosed. This 3T3-L1 clonal cell line has the unique characteristic of accumulating large amounts of triglyceride fats in its resting state, which makes it useful for screening drugs to determine their effect on cell fat accumulation.
Abstract: A superconducting machine having a wound damper-shield winding disposed in the cold region of the machine and having electrical leads to a warm region. Electric current control means at the warm region is connected to the leads and acts to pass current in a predetermined pattern as a function of voltages that appear across the leads as a consequence of transients in the machine.
November 13, 1974
Date of Patent:
December 21, 1976
Massachusetts Institute of Technology
James L. Kirtley, Jr., Joseph L. Smith, Jr.
Abstract: A high voltage rotating electric machine having an armature that includes a continuous gradient a-c winding and comprising a high permeability magnetic material subdivided in the circumferential direction into a plurality of segments. Each segment is electrically insulated from every other segment.