Abstract: A combination electric heat and microwave oven employing a common cavity for cooking food with either microwave energy, electric resistance heating, or both in which the oven is supplied with microwave energy through a rotating multi-port radiator having a plenum fed from a magnetron through a waveguide and a coaxial line whose outer conductor extends into the plenum and whose central conductor supports said radiator.

Abstract: A semiconductor integrated circuit device of the beam lead type having a semiconductor interconnection substrate with apertures for integrated circuit chips therein and with metallization patterns having sharply pointed ends for penetrating oxide layers over the bonding pads of the chips and for making electrical connection thereto. Devices thus produced may be assembled and tested and failed chips replaced as necessary before the chips are ultrasonically welded to the interconnection metallization and before final fabrication of the device. The invention also includes a method for producing an interconnection substrate in which a plurality of conically shaped holes are etched into a semiconductor wafer having sharp points within the body of the wafer. A metal layer is deposited over the surface of the semiconductor wafer filling the etched holes. Sharp points are thus formed on the metal in the etched holes.

Abstract: A coherent detection scanning laser system having an optical system that compensates for the angular deviation of the received signal resulting from the scanning process, and having a detection system with output independent of spatially varying sensitivity or response of the detector caused by inhomogeneities therein.In one embodiment, the local oscillator reference signal is compensated for the lag angle and the detector is placed at the image plane of the scanning antenna, and system geometry is arranged so that the image plane of the mirror providing the compensating reference signal coincides with the image plane of the scanning antenna. In another embodiment, the received signal is compensated for lag angle and the system geometry is arranged so that the detector receives a focused signal permitting the use of a smaller area.

Abstract: A scanning laser doppler system in which the change in angle between transmitted and received beams caused by the finite transit time to the target is automatically compensated. The scanning beam is produced as a downward looking Palmer scan pattern by an expanded laser beam transmitted through a rotating wedge. The rotating wedge is tilted in accordance with the invention to align the received beam with a portion of the transmitted beam upon a detector.

Abstract: An interactive tabular display system having thin membrane switches positioned on the display surface around the periphery. The switches are categorized as select or function depending on the particular application software program in use. Touching one of the select switches causes a cursor to be displayed in the row adjacent to that switch; automatically, the cursor incrementally advances across that row sequentially underlining data items. When the switch is opened, the data item underlined is displayed in reverse video and additional data related to that item is displayed elsewhere on the display. The switches are provided with backlighting to provide illuminated touch points for use in dimly lit operational rooms.

Abstract: A dielectric heating oven having a set of parallel spaced electrodes alternately grounded and every ungrounded electrode fed by electromagnetic energy from a common source in an ISM band preferably from 13.56 megacycles to 40.68 megacycles. Food is placed on top of the electrodes and the depth of penetration of the electric fields into the food is a function of the phase relationship of the energized electrodes. When all energized electrodes are feed in the same phase, maximum field coupling is to the grounded electrodes between them resulting in high intensity searing electric fields close to the surface of the food. Deeper penetration cooking is accomplished by feeding adjacent energized electrodes 180.degree. out of phase so that maximum field coupling is between them rather to the grounded electrode between them. Still further penetration cooking results from feeding all adjacent energized electrodes 90.degree. out of phase so that maximum field coupling is to alternate energized electrodes.

Abstract: A method for producing high peak energy radiation from a gaseous lasing medium excited by a main electric discharge which is transverse to the laser beam path. The main electric discharge current flows between elongated copper main electrodes positioned on opposite sides of the laser path and follows a pre-ionizing discharge between a plurality of copper elements positioned adjacent the optical path. The pre-ionizing discharge is selected in time and intensity to produce a gradation of temperatures along a thin layer of copper oxide formed on the copper elements and catalytically aiding in rapid recombination of carbon monoxide with the free oxygen which is produced by the discharge between the main electrodes.

Abstract: A system for the generation of a set of voltages, such as the X and Y coordinate voltages of a display or automated milling machine, includes a character generator and a character positioning circuit which, in turn, are responsive to digital control signals as are produced by a computer. A detector compares detection signals to reference signals at successive instants during the use of the system. The computer utilizes a learning routine in conjunction with voltage generation circuitry to develop the reference signals. The computer is programmed to provide specific values of the digital control signals at the times of the comparisons by the detector to detect any deviation of the magnitudes of the voltages of the deflection circuitry from the magnitudes attained during an initial alignment of the system.

Abstract: A resonance isolator in which microwave ferrite bars are positioned in and in contact with a waveguide to achieve unilateral absorption and in which ceramic permanent magnet bars are positioned on the outside of the waveguide adjacent to the ferrite bars and are insulated by a thin sheet of thermally insulating material that also acts as a spacer to adjust the magnetic field. The waveguide may be made with nonmagnetic sheet metal and the ferrite bars may be used as extruded. The isolator is adapted to connect between a microwave generator, such as a magnetron, and a microwave load, such as a heating chamber, and forms an integral feed unit. The isolator effectively reduces the peaks of the standing wave caused by the power reflected by a load and protects the generator against premature degradation and extends its useful life time.

Abstract: A four-frequency laser gyroscope system having improved accuracy is constructed using a single solid block of low thermal coefficient of expansion material. A four-segment nonplanar propagation path provides a first frequency splitting. A second splitting is provided by a Faraday rotator having a thin slab of rare earth-doped glass positioned within an aperture in a permanent magnet. A narrow angle of incidence is provided for the beams of incident upon the output mirror to prevent cross coupling between beams within the output optics structure. Blocking the gaseous flow path reduces output frequency drift caused by contamininating particles.

Abstract: A radar system transmits a signal to a target wherein the frequency is modulated with a sinusoidal modulation pattern. The difference between the actual target range and an estimate thereof is subjected to a spectral analysis wherein the spectral terms are described by Bessel functions. A second order range tracking loop, responsive to the relative magnitudes of the spectral terms, and an estimator of target radial acceleration, responsive to successive values of the spectral terms, provide components of the range estimate.

Abstract: A multiplexer circuit is disclosed wherein a diode ring circuit is coupled to a pair of logical signal sources and a first winding of a transformer. A second winding of the transformer is coupled to a control signal source. One of the pair of logical signal sources is coupled to a center tap of the first winding selectively in accordance with the control signal.

Abstract: A surface acoustic wave (SAW) device is provided with short-term and long-term stability by recessing the electrode structure into the surface of the piezoelectric crystal of the device. In addition, the surface is passivated with the silicon polymer, and a cover of the same crystalline material is placed above the electrode structure to prevent absorption of impurities into the surface from the atmosphere. The passivation is believed to reduce the effect of thermal agitation of the bonds of the crystal lattice structure, and thereby prevent the making and breaking of chemical bonds with hydroxyl ions that may have been entrapped from the atmosphere. The SAW device is particularly useful in the construction of stable oscillator circuits wherein the passivation provides improved short-term frequency stability and the cover provides long-term frequency stability.

Abstract: A digital memory system adapted to store a sequence of one bit quantized samples of an input signal having a frequency within a predetermined band of frequencies and to produce a replica of such input signal from such stored one bit samples. A control signal is produced indicative of the particular portion of the band of frequencies which includes the frequency of the input signal. A plurality of filters is provided, each one tuned to a different portion of the band. In response to the control signal the sequence of bits read from memory passes through the filter which is tuned to the portion of the band which includes the frequency of the input signal. With such arrangement many unwanted harmonics produced because of the one bit quantization of the input signal are removed.

Abstract: A multiplexer system providing a transmission frame field containing information derived from the cumulative total of stuff bits used over a plurality of frames. The stuff bits which also have assigned positions in the transmission frame are generally used in asynchronous systems to compensate for the input data rate of a group not being a fixed submultiple of the transmission rate. The demultiplexer system uses the information derived from the cumulative total to improve the bit count integrity performance of data channeled out to a user device. Also, during transmission fade conditions, the demultiplexer uses information derived from the frequency of past stuff operations to maintain group bit count close to its expected value.

Abstract: A beam of sound, of sufficient amplitude for inducing a finite amplitude effect in water, is directed into a field of sound for interaction therewith to produce intermodulation products. Energy is removed from the sound field in the formation of the intermodulation products resulting in an attenuation of sound in the sound field.

Abstract: A system for displaying, performing positioning, sizing, and performing supportive composition functions for newspaper advertising layout in which characters and symbols are displayed with a height and width closely approximating the height and width of the actual printed characters. Characters are displayed as rows and columns of dots. Preselected rows and columns are deleted or repeated to decrease or increase the size of a character from a standard fixed size. Interactive work stations position copy, edit and correct text, adjust style and point sizes, to accomplish accurate composition functions. A Bit Image Memory digitally stores all displayed patterns including the character dot patterns directly to minimize the response time of the system to operator inputs. An arithmetic unit is disclosed which produces lines which also accurately represent the final copy.

Abstract: A microwave suppression apparatus having two lengthwise tunnels and a plurality of septums that sequentially move through both tunnels in a continuous loop. The septums form microwave seals with inner wall portions of the tunnels to prevent the leakage of microwave energy through an access opening in an energized enclosure. A conveyor which carries a product through the access opening to the energized enclosure also passes through one of the two tunnels of the suppression apparatus.

Abstract: A digitally controlled CRT display system providing display intensity levels having equal ratios of luminances for consecutive steps over a plurality of brightness control settings. The digital video is added to a digital brightness code and the sum is converted to an analog signal that is coupled to the cathode of the CRT. The digital-to-analog converter provides a transfer characteristic such that the consecutive gray shade steps have a constant ratio of luminance.

Abstract: A system for forming a beam of radiant energy which is incident upon or radiated from an array of radiating elements such as sonar transducers. As a wavefront progresses across the array, samples of signals received by individual ones of the transducers are selected in accordance with specific beams to be formed, the selected samples being summed together through a sequence of partial summations until a complete summation of a sample of a beam is obtained. The sequence of partial summations is initiated successively for each output sampling interval. For a long array, wherein the transit time of a wavefront across the array is longer than the intersample interval, a plurality of the sequences are generated concurrently. All partial sums for all beam samples are generated periodically at the output sampling rate and are stored in a memory.