Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 7323831 | Illumination device An illumination device has an illumination unit which glows when current flows through a load thereof, at least one instruction unit for instructing the illumination unit to glow, a PWM signal generating unit which generates a plurality of PWM signals based on that ... | 01/29/2008 |
| 7257547 | Service managing system A service managing system comprises: order terminals for enabling customers to view contents of service items and to order desired items, and being portable and driven by a battery; order-receiving terminals for receiving and indicating orders from the order termina... | 08/14/2007 |
| 7164246 | Movable barrier operator A movable barrier operator having an electrical motor responsive to control signals for moving the barrier, a controller to control the barrier movements, and two command apparatuses for generating command inputs, which command apparatuses are located remotely from ... | 01/16/2007 |
| 7139613 | Implantable medical device communication system with pulsed power biasing An implantable medical device communication system communicates information between an implantable medical device and at least one slave device by way of a two-wire bus. Slave devices may include remote sensors, actuators and other implantable medical devices. The i... | 11/21/2006 |
| 7113541 | Method for software driven generation of multiple simultaneous high speed pulse width modulated signals Systems and methods can provide, in one aspect, a method for modulating the pulse width of control signals generated on a plurality of separate channels. In one practice, the methods described herein are suitable for execution on a microprocessor or micro controller... | 09/26/2006 |
| 7098770 | Contactless integrated circuit reader The present invention relates to a contactless integrated circuit reader operating by inductive coupling, comprising an antenna circuit for sending an alternating magnetic field, circuits for applying an alternating excitation signal to the antenna circuit and circu... | 08/29/2006 |
| 7071850 | Method and apparatus to facilitate transmission of ternary movable barrier operator information Ternary data as corresponds to a movable barrier operator is provided (21) and converted (22) into corresponding binary information. In a preferred approach this comprises converting each ternary trit into a corresponding binary pair. Pursuant to a pre... | 07/04/2006 |
| 7054361 | Method and apparatus for enhancing an infrared signal protocol An apparatus and method for providing control signals, comprising a processor coupled to a memory, for generating a signal sequence. The processor encodes the signal sequence into a plurality of symbols using a 5 pulse position modulated (5 PPM) scheme. Advantageous... | 05/30/2006 |
| 7049752 | Light emitting diode control device A control device of LEDs includes a lighting-up circuit and a lighting-out circuit, both of which generate pulse signals being pulse-width modulated by varying cycles and corresponding duty ratios based on an input signal during a start-up period and a falling perio... | 05/23/2006 |
| 7026916 | Tabletop signaling device for restaurants The tabletop signaling device for restaurants comprises a tabletop signaling device for visually signaling at least one of a plurality of messages to a waiter or waitress quickly and wordlessly, without requiring the service provider to physically respond and inquir... | 04/11/2006 |
| 7013178 | Implantable medical device communication system An implantable medical device communication system communicates information between an implantable medical device and at least one slave device by way of a two-wire bus. Slave devices may include remote sensors and other implantable medical devices. The implantable ... | 03/14/2006 |
| 6995682 | Wireless remote control for a winch A wireless winch control system having a wireless remote transmitter for transmitting AM/PWM modulated signals. A processor in the wireless remote transmitter periodically transmits control signals while a forward or reverse button remains pushed. Once the button is... | 02/07/2006 |
| 6960982 | Electronic control unit for variable PWM communication An electronic key entry system for vehicles has a security ECU mounted in a vehicle for checking an electronic key via radio communication with the same. The ECU includes a CPU and a PWM output unit. The PWM output unit generates an interrupt request at every edge t... | 11/01/2005 |
| 6931075 | Event detection with a digital processor A bistable memory device changes logic state each time an event occurs. The bistable memory device has an logic output coupled to a digital processor input. The digital processor reads the logic state of the bistable memory device from its logic output and compares ... | 08/16/2005 |
| 6775323 | Data coding system A data coding system for coding data represented by a number of symbols is described. The system includes representing each symbol with a unique digital waveform. All the unique digital waveforms have a duty cycle greater than 50% or a duty cycle less than 50%. ... | 08/10/2004 |
| 6560279 | Two wire multiplex data acquisition system with remote unit mode controls A data acquisition system that utilizes a two wire network having a plurality of randomly located remote units connected to a central unit which is adapted to transfer voltage values to and from the remote units. A pulsewidth and pulse count protocol is e... | 05/06/2003 |
| 6172609 | Reader for RFID system A reader (10) capable of efficiently reading tags (12) of differing protocols in a radio frequency identification system. The tag may be either a full-duplex tag or a half-duplex tag. The reader includes a display (16), a power switch (18) and a read swit... | 01/09/2001 |
| 6018513 | Communication control apparatus A communication control apparatus, provided with an echo back comparison detecting unit (30) detecting something abnormal of communication data from itself or an abnormal state generated at a data line (4), by starting transmission of communication data f... | 01/25/2000 |
| 5945920 | Minimum voltage radio frequency indentification A radio frequency identification device (RFID) which permits various read and write operations at various voltage levels. Certain read operations are permitted as soon as the voltage level in the RFID is sufficient for the circuitry to switch. Errors duri... | 08/31/1999 |
| 5926111 | Pulsed width modulated remote signalling and location identification system for summoning a service industry worker A system for summoning a service industry worker using pulsed width modulation for remote signalling having a number of signalling switches, each connected to a transmitter. When a switch is activated, the corresponding transmitter transmits an RF carrier... | 07/20/1999 |
| 5875244 | Transmission apparatus for relaying different types of trunk signals A transmission apparatus for relaying different types of trunk signals, including a central processing unit including a reception counter processor which is inserted between a pair of exchanges and enables direct relay of exchange trunk signals (Sxt) and ... | 02/23/1999 |
| 5864582 | Pulse width extension with analog command A method of modulating the pulse width of a pulse width signal in response to an analog signal. The steps include changing the analog signal to a digital signal, changing the digital signal to a number of counts, changing the number of counts to a time de... | 01/26/1999 |
| 5680102 | RF data communication link for wireless audible indication system A wireless audible indication system comprising a transmitter and a receiver. An embodiment of the transmitter includes a modulator formed by a microprocessor and a radio frequency oscillator. The modulation format employed is selectable by the user using... | 10/21/1997 |
| 5623515 | Data communication system for reducing a risk of transmission errors A data communication system comprises a main device with a first microcomputer and an operating device with a second microcomputer. The devices are connected to each other by a first wire and by a second wire. In addition to that, input interrupt terminal... | 04/22/1997 |
| 5566081 | Method of saving power consumption in a battery operated pager receiver In order to effectively reduce power consumption of a radio pager, an originally determined time period for which power is supplied to high power drain circuitry, is narrowed in the case where the interval between two adjacent code signals transmitted fro... | 10/15/1996 |
| 5521593 | Method and apparatus for monitoring operating characteristics of semiconductor electric power switching circuits A monitoring system for an electrical power control system having a plurality of electrical components operable in electrically conductive and non-conductive states in response to command signals from a system controller. The controller is connected for r... | 05/28/1996 |
| 5469152 | Remote control device that transmits signals indicating termination of key pressing operations A remote control device controls an electronic system that has a number of functions. The remote control device has a limited number of function keys, and certain keys correspond to different functions of the electronic system. In order to permit discrimi... | 11/21/1995 |
| 5438328 | Circuit for measuring pulse width of remote control signal A circuit for measuring a pulse width of a remote control signal comprises a receiver for receiving a remote control signal exhibiting at least one pulse; an amplifier for shaping and amplifying the received remote control signal to produce a correspondin... | 08/01/1995 |
| 5436897 | Multiplex wiring system using varying duration pulse width modulation A method and apparatus is used in a motor vehicle to serially communicate data between two or more communication nodes coupled to a data bus. Each communication node receives and transmits information on the data bus. Signals representative of operation o... | 07/25/1995 |
| 5436853 | Remote control signal processing circuit for a microcomputer A remote control signal processing circuit uses hardware to check the pulse of the remote control signal, detect the leader code, and make "0" or "1" judgment for status code or data code. Based on the edge detection signals given by the edge detection ci... | 07/25/1995 |
| 5363405 | Vehicle communications network transceiver, bus driver therefor A transceiver device for use with a microcontroller and a symbol encoder decoder device (forming a node in a communications network) for transmitting and receiving variable pulse width modulated (VPWM) analog signals containing symbol messages over a comm... | 11/08/1994 |
| 5345231 | Contactless inductive data-transmission system A contactless inductive data transmission system provides bidirectional signal transfer between a sending-and-receiving station and one or more batteryless transponders. A high-frequency signal from the sending-and-receiving station is pulse width modulat... | 09/06/1994 |
| 5337042 | Vehicle communications network transceiver, transmitter circuit therefor A transceiver device for use with a microcontroller and a symbol encoder decoder device (forming a node in a communications network) for transmitting and receiving variable pulse width modulated (VPWM) analog signals containing symbol messages over a comm... | 08/09/1994 |
| 5311548 | Digital control electronic having a pulse width modulated (PWM)-output signal for the control of electric control elements of a hydraulic system A digital electronic control apparatus for controlling at least one electronic control element comprises. The apparatus comprises first and second pulse width modulated output signal generators, the frequency of the second signal being different from the ... | 05/10/1994 |
| 5227779 | Codable electronic devices Pulses of a carrier signal supplied to an input circuit of a codable electronic device, e.g. a transponder tag, are divided by a chain to provide a logic signal, the value of which depends on the length of the pulse, the logic signal only being entered in... | 07/13/1993 |
| 5189409 | System for controlling terminal equipment A terminal equipment control system which controls the operation state of multiple terminals having data communication with master equipment. A control signal of a specified duration is output from the master equipment to each of a plurality of multiple t... | 02/23/1993 |
| 5134632 | Decoding binary-coded transmissions A biphase-mark coded digital audio signal comprising short and long pulses (IEC 958) is decoded despite substantial variation of sample rate but without a separate synchronization or timing signal and without a phase locked loop. The pulse lengths are mea... | 07/28/1992 |
| 5128677 | Apparatus and method for transferring data along a serial data bus An apparatus and method are disclosed for transferring data between devices located on a serial data bus of a data communication system. A first counter and flag are provided which are associated with a device on the serial data bus. The first counter and... | 07/07/1992 |
| 5103209 | Electronic article surveillance system with improved differentiation An electronic article surveillance system which is capable of reliably identifying and discriminating between the different signatures of tags and labels which may come to pass in its vicinity, improving the reliability of the system and even permitting t... | 04/07/1992 |
| 5065078 | D.C. motor control circuit for radio controlled toy A control circuit for a DC motor which drives a radio controlled toy. The control circuit receives a signal whose pulse width contains information relating to the desired speed and direction in which the motor is to turn. If the pulse width is greater tha... | 11/12/1991 |
