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| Number | Title | Issue Date |
| 7061623 | Interferometric back focal plane scatterometry with Koehler illumination An interference spectroscopy instrument provides simultaneous measurement of specular scattering over multiple wavelengths and angles. The spectroscopy instrument includes an interference microscope illuminated by Koehler illumination and a video camera located to i... | 06/13/2006 |
| 7054071 | Mireau interference objective lens A Mireau interference microscope is corrected for spherical and other aberrations induced by the beamsplitter and mirror support windows by incorporating a cover glass correcting-objective lens. The support windows for the beamsplitter and mirror have a combined thi... | 05/30/2006 |
| 5335557 | Touch sensitive input control device A family of controllers incorporate multiple force/touch sensitive input elements to provide intuitive input in up to six degrees of freedom, including position and rotation, in either a Cartesian, cylindrical or spherical coordinate system. Six dimension... | 08/09/1994 |
| 5276909 | Traffic information broadcast system A broadcast and reception system provides a segmented broadcast signal for providing regional traffic information and a receiver adapted to receive selected segments of that broadcast. The segmented broadcast signal includes a number of segments which eac... | 01/04/1994 |
| 5235677 | Raster graphics color palette architecture for multiple display objects A raster graphics color palette architecture for multiple display objects or sprites includes a first memory for storing pen index information for each display object. The pen index information for each display object includes pen index information corres... | 08/10/1993 |
| 5172534 | Chainable building blocks A construction set is made up of a plurality of detachably chainable links capable of being pivotally attached to one another to form stable geometric structures. Detents are provided at a plurality of pivot positions so as to preferentially hold the enga... | 12/22/1992 |
| 5138154 | Shaft angle encoder with rotating off-axis interference pattern A shaft angle encoder adapted for use in a hand-held gyroscope has a motor at the core of the gyroscope suspended by two pairs of orthogonal gimbals to provide two-degrees-of-freedom for the inner gimbal. Power is provided to the motor through conductive ... | 08/11/1992 |
| 5113511 | System for dynamically providing predicted high/slow speed accessing memory to a processing unit based on instructions A system (60) for predicting CPU addresses includes a CPU (34) connected by bus (62) to page mode address predicting circuit (64). The page mode address predicting circuit (64) is connected to memory arbitration circuits (66) by bus (68). The memory arbit... | 05/12/1992 |
| 4974486 | Electric stringless toy guitar An electronic musical instrument shaped like an electric guitar sounds individual notes that are synthesized to sound like an electric guitar. These notes may either be selected randomly selected by a player or from segments of prearranged musical tracks.... | 12/04/1990 |
| 4862152 | Sonic positioning device A three-dimensional ultrasonic position control device suitable for controlling computer displays or robot movements is disclosed. More specifically, signals from an ultrasonic transmitter are received by multiple receivers. The received signals are processed ... | 08/29/1989 |
| 4350953 | Time interval measurement apparatus A triggerable oscilloscope having a digital clock selectably connected to two digital counters accurately measures a time interval between two recurring events. The first digital counter is connected to the digital clock to count clock pulses during a tim... | 09/21/1982 |
| 4317985 | Dual heater stabilization apparatus and method for a crystal oven A proportional oven having two heaters mounted to a thermally conductive base stabilizes the temperature of a temperature sensitive crystal mounted on the thermally conductive base by adjusting the ratio of powers applied to the two heaters.... | 03/02/1982 |
| 4266125 | Optical shaft angle encoder An optical comparator has three bifurcated and truncated lenses, each lens having two siamesed and truncated elements having closely spaced optical axes. This results in an optical encoder having a low sensitivity to eccentricity errors.... | 05/05/1981 |
| 4263506 | Pulse generating apparatus A three-channel optical shaft angle encoder has two channels for encoding the incremental angle and the direction of rotation of a shaft. A third channel provides a synchronizing index pulse for encoding the absolute position of the shaft once per revolut... | 04/21/1981 |
| 4250562 | Digital signal state analyzer and display A general purpose logic state analyzer selectively stores, formats and displays a digital signal representing a sequence of data states input thereto and provides a graphical display of the stored data states and a count of selected events occurring inter... | 02/10/1981 |
| 4225878 | Integrated circuit on chip trimming In a monolithic integrated circuit, on-chip trimming is implemented by connecting a zener diode across each element of a plural element trimmable resistor. Adjacent diodes are connected back to back and a pair of conventional bonding pads connected theret... | 09/30/1980 |
| 4197493 | Electrostatic voltmeter An electrostatic voltmeter for measuring the electrostatic potential on a photosensitive drum has a detector capacitively coupled to the drum for providing an output signal in response to the potential on the drum. An AC voltage source is coupled in circu... | 04/08/1980 |
| 4179351 | Cylindrical magnetron sputtering source Placement of cylindrical magnets inside of a cylindrical cathode comprising a source of depositing material for sputter depositing of the material upon the interior surface of a substantially cylindrical workpiece, results in improved deposition rates, lo... | 12/18/1979 |
| 4170222 | Solar heat collector A solar heat collector constructed from transparent material utilizes a circulating absorptive fluid medium to collect solar energy. The collector comprises a plurality of cascaded fluid reservoirs, each reservoir having a self-draining feature active dur... | 10/09/1979 |
| 4150432 | Frequency counter and method An averaging frequency counter for determining the frequency of recurrence of input signals has an event counter for counting a number of the input signals, a gate counter for counting a number of time intervals during which the input signals are counted,... | 04/17/1979 |
| 4147413 | Temperature compensated lens mount An epoxy/aluminum sandwich is used to mount a glass lens rigidly within a stainless steel cell without subjecting the glass lens to stresses caused by differences between the temperature coefficients of expansion of the glass lens and the stainless steel ... | 04/03/1979 |
| 4127811 | Auto-calibrating voltmeter A voltmeter having multiple voltage ranges comprises substantially linear elements such that the transfer functions of the elements can be independently measured and logically combined to derive the transfer function of a given combination of elements con... | 11/28/1978 |
| 4113381 | Surveying instrument and method A tacheometer utilizes a gallium arsenide laser diode in a phase shifting distance encoder, a sinusoidal interpolator in a phase shifting shaft angle encoder, a mercury pool in a phase shifting two axis off-level encoder, a shared phase to digital decoder... | 09/12/1978 |
| 4108539 | Reflecting lens system A tacheometer utilizes a gallium arsenide laser diode in a phase shifting distance encoder, a sinusoidal interpolator in a phase shifting shaft angle encoder, a mercury pool in a phase shifting two axis off-level encoder, a shared phase to digital decoder... | 08/22/1978 |
| 4109183 | Third channel oscilloscope display for trigger signal An oscilloscope has an additional vertical display mode to enable the display of the trigger signal, activating the sweep generating circuit, simultaneously with the display of the normal vertical channels. The triggering source, level, slope and subtle t... | 08/22/1978 |
| 4107651 | Glitch detector A method and circuit for detecting spurious transitions ("glitches", herein) upon a digital signal utilizes a test for such a glitch condition dependent upon the digital signal level and upon the polarity of subsequent transitions within a discrete sampli... | 08/15/1978 |
| 4103182 | Programmable transfer gate array A programmable transfer gate array generates control signals as functions of input variables in a digital logic circuit by using two-phase logic requiring no quiescent D.C. power consumption.... | 07/25/1978 |
| 4100532 | Digital pattern triggering circuit A digital pattern triggering circuit combines an addressable memory and a processor. Input data patterns address corresponding memory elements whereby data previously stored in the memory by the processor is accessed, providing an indication of whether a ... | 07/11/1978 |
| 4082998 | Dual slope integration circuit A circuit for performing dual slope integration to provide a digital measurement of an input voltage of either positive or negative polarity employs a single source of reference potential in combination with a switchable resistive network as a source of r... | 04/04/1978 |
| 4065796 | Digital data decoder A digital data decoder for recovering data from magnetic media utilizes a phase-locked loop incorporating a dual slope detecting circuit and a window margin test so as to allow for higher density data and for quality verification of the data without the u... | 12/27/1977 |
| 4054788 | Modular binary half-adder Half-adder logic modules employing separate summing and carry circuitry are used in the construction of a modular binary half-adder. Carry bits of less significant digits are calculated independent of and prior to the calculation of corresponding sum bits... | 10/18/1977 |
| 4049477 | Method for fabricating a self-aligned metal oxide field effect transistor An improved and simplified method of fabricating field effect transistors in metal oxide semiconductor integrated circuits advantageously employs the differential growth rate, under certain temperature conditions, between oxide on silicon wherein phosphor... | 09/20/1977 |
| 4049980 | IGFET threshold voltage compensator A circuit is described which compensates for variation in the threshold voltage of Insulated Gate Field Effect Transistors (IGFETs) in an integrated circuit by modulating the substrate voltage in response to the variation of the threshold voltage from a d... | 09/20/1977 |
| 4030016 | Precision active rectifier circuit An improved feedback/compensation scheme for a precision active rectifier circuit improves the slew rate and loop gain during diode switching and thereby reduces fractional scale linearity problems.... | 06/14/1977 |
| 4017801 | Low frequency triangular waveform generator A low frequency triangular waveform generator mixes two high frequency squarewaves having a constant frequency difference to produce a triangular waveform with a fundamental frequency equal to the difference in the fundamental frequencies of the mixed squ... | 04/12/1977 |
