Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 5075847 | Method and apparatus for computer program encapsulation A method and apparatus for encapsulating an application tool into a computer-aided software development system that includes a number of standard software development tools. The application tool is integrated into the software development system without m... | 12/24/1991 |
| 5073968 | Method and apparatus for marking emulation analysis states Additional memory for holding marking tags is used for providing additional information regarding states acquired by an emulator during tracing for dequeueing. The marking tags are determined according to a predetermined coding scheme, loaded in a marking... | 12/17/1991 |
| 5041831 | Indirect D/A converter A plural channel indirect digital to analog converter. Words containing address bits and data bits are received on an input and entered into a specific one of the converter channels under control of the address bits of the word. The data bits are applied ... | 08/20/1991 |
| 5025364 | Microprocessor emulation system with memory mapping using variable definition and addressing of memory space A memory mapper for an emulation system suitable for a microprocessor-based system for any size microprocessor is disclosed which uses function code comparators, range comparators, and offset values for individual mapping definitions, thereby providing fa... | 06/18/1991 |
| 4998263 | Generation of trigger signals Apparatus for generating trigger signals for a serial stream of bits which has continuously repeating patterns and which has been formed by serializing a plurality of parallel streams, for example, a maximal length PRBS. The apparatus operates by identify... | 03/05/1991 |
| 4996695 | Arrangement for accessing and testing telecommunication circuits An arrangement is provided for selectively accessing and testing a digital telecommunications circuit (1) without detriment to the integrity of a signal carried thereby. The arrangement comprises an access unit (10) inserted in the circuit (1) to be teste... | 02/26/1991 |
| 4985900 | Non-intrusive channel-impairment analyzer A non-intrusive channel-impairment analyzer is provided for measuring at least one quasi-static impairment characteristic of a band-limited data communications channel. The analyzer comprises a data receiver section and a measurement section. The data rec... | 01/15/1991 |
| 4975636 | Method and apparatus for selecting and displaying a high resolution window from a main display A windowed portion of a displayed waveform under test, typically from an oscilloscope display, is simultaneously displayed at a higher resolution by using a software program in conjunction with the existing timebase circuit rather than using a second time... | 12/04/1990 |
| 4941161 | Detection of digital signal error rates Error rates above a given threshold are detected by initiating a counter to count a group of n bits on each occurrence of an error bit. The counters are inspected on each occurrence of an error to see whether the counter initiated x error bits earlier is ... | 07/10/1990 |
| 4940979 | Combined rate/width modulation arrangement Pulse modulation circuitry which receives n binary data bits and generates a rate/width pulse modulated signal representing the binary value of the received data bits. The lower order m of the n bits generate a rate modulated signal having a number of pul... | 07/10/1990 |
| 4939396 | Detector circuit A detector circuit for detecting a state change of an unknown binary signal has a control circuit generating two pulse sequences which are shifted in time against each other and two flip-flops. The first pulse sequence activates the first flip-flop and cl... | 07/03/1990 |
| 4891607 | Low distortion drive amplifier The low distortion drive amplifier of the present invention uses an emitter follower circuit to drive a low impedance load such as a transmission line. A constant current source is connected to the emitter terminal of the emitter follower transistor to pr... | 01/02/1990 |
| 4891508 | Precision infrared position detector apparatus for touch screen system The precision infrared position detector apparatus uses an information display device that has a substantially cylindrical shaped screen to limit curvature of the screen to a single dimension. In addition, to compensate for this curvature, a flexible prin... | 01/02/1990 |
| 4852043 | Daisy-chain bus system with truncation circuitry for failsoft bypass of defective sub-bus subsystem A plurality of data transmitting and receiving devices (1) are inter-connected by an interface bus system configured as two or more sub-bus systems (2,3,4) connected into a chain by a corresponding number of communication links (5). Each sub-bus system (2... | 07/25/1989 |
| 4835491 | Clock signal generation A clock signal generator is based on a phase locked loop arrangement. The loop includes an adjustable divider. The reference signal for the loop is applied to another adjustable divider. This allows the generation of a wide range of frequencies by appropr... | 05/30/1989 |
| 4829293 | Method and apparatus for achieving variable and infinite persistence Method and apparatus for achieving unlimited and variable presistence in a digital oscilloscope having a samplier, analog-to-digital converter, high speed memory, microprocessor, linked list memory, display memory with bits corresponding to pixels on a ra... | 05/09/1989 |
| 4827434 | Method for time modulation in vector film recorders Time modulation in a vector film recorder is used to control the color of an image to be recorded by using a constant intensity electron beam and controlling the number of electron beam sweeps for each primary color in a color filter wheel and for each ve... | 05/02/1989 |
| 4820969 | Polarity compensated apparatus for measuring the impedance of a polar device This invention provides a polar device measuring apparatus which can bias a device under test in a proper polarity. The measuring apparatus is computer-controlled and automatically selects the polarity of the bias voltage based on the measured value of vo... | 04/11/1989 |
| 4812681 | NMOS analog voltage comparator An NMOS analog voltage comparator is disclosed having two matching cascaded inverter-pairs. The comparator has fast response time, is not sensitive to temperature variations while operating, and operates independent of integrated circuit parameter variati... | 03/14/1989 |
| 4658341 | Regulated DC power supply A regulated power supply that provides two desired direct current voltages at respective outputs thereof, the supply maintaining the difference between voltages appearing at the outputs the same as the difference between the desired values, series regulat... | 04/14/1987 |
| 4656598 | Alias detector for digital oscilloscopes An alias detector for digital oscilloscopes is provided to detect inaccurate reconstructions of waveforms. Testing may be done according to the Nyquist criterion of a minimum of two points per period of the waveform or according to a user-specified criter... | 04/07/1987 |
| 4647140 | Electrical connectors A printed circuit board connector is disclosed in which contacts of the connector are self-cleaning as the board is inserted into or extracted from the connector.... | 03/03/1987 |
| 4634210 | Electrical connectors A printed circuit board connector is disclosed in which contacts of the connector are self-cleaning as the board is inserted into or extracted from the connector.... | 01/06/1987 |
| 4618510 | Pre-passivated sub-micrometer gate electrodes for MESFET devices A method of fabricating sub-micrometer gates in a semiconductor device is disclosed in which a pre-passivation layer is formed over the gate region during fabrication. This pre-passivation layer protects the gate and underlying gate trough region from sur... | 10/21/1986 |
