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A personal computer peripheral, battery powered reward candy dispenser which immediately presents students with a single candy for each problem completed correctly.
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| Number | Title | Issue Date |
| 4403111 | Apparatus for interconnecting data communication equipment and data terminal equipment An interface for connecting data terminal equipment (DTE) to data communication equipment (DCE) is provided which requires no modification to an existing and widely accepted DCE connector and yet which permits data communication according to more recently... | 09/06/1983 |
| 4402082 | Automatic line termination in distributed industrial process control system A control system for controlling an industrial process includes a plurality of remotely located process control units (remotes) each coupled to an associated input/output device(s) and adapted to communicate with one another through a dual channel communi... | 08/30/1983 |
| 4398297 | Data set diagnostic system A voiceband data set network includes a control data set (10), a plurality of tributary data sets (4a, 4b . . . 4n) and a diagnostic control device (5). User-provided data is communicated between the control data set and the tributary data sets via a prim... | 08/09/1983 |
| 4398298 | Communication system having stations capable of detecting another station's A communication system comprising a connecting line and stations connected thereto, each station having free access to the connecting line. In a station which requests or has access, a transmitting stage and a receiving stage are both connected to the lin... | 08/09/1983 |
| 4384356 | Wide band modem for high speed data transmission A method and apparatus are described for coupling a high-speed data communication modem to a communication line such as a coaxial cable with minimal transmission losses when the modem is not transmitting data. The transmitter coupling apparatus comprises ... | 05/17/1983 |
| 4361904 | Method of testing transceiver and transceiver including testing apparatus An ultra high frequency transceiver which transmits a modulated carrier wave and mixes a received signal with a locally generated signal to produce an intermediate frequency signal is tested by using the same transmitter as used during normal transceiver ... | 11/30/1982 |
| 4354252 | Programmable digital data terminal for mobile radio transceivers In a data transmission system, for communicating messages between a base station and a plurality of mobile stations, each mobile station includes a radio frequency transceiver and a programmable data terminal for sending and receiving predeterminedly form... | 10/12/1982 |
| 4352201 | Data transmission system A system for the transmission of data from a number of out-station transmitters to a central receiver over a communication line or channel in which each out-station transmitter has an associated timer and a detector which "listens" to the line or channel ... | 09/28/1982 |
| 4341927 | Data transmission apparatus Signal data is generated by interconnected non-inverting and inverting voltage followers and is transmitted on power-carrying conductors to a remote detection circuit comprising a differential amplifier which receives equal in-phase signal inputs of oppos... | 07/27/1982 |
| 4326293 | Transmitter-receiver with automatic alternation control Prior to each voice activity period, the transmitter supplies a digital preamble for coding the speech signal levels and during these periods high frequency signals modulated in substantially constant amplitude, but transmits nothing other than said pream... | 04/20/1982 |
| 4272843 | System for transmitting service communications A radio system composed of a transmitter and an associated receiver in combination with a data transmission device and an associated voice instrument. Service channel signals operating at a frequency at the lower end of the system base band are conducted ... | 06/09/1981 |
| 4270214 | High impedance tap for tapped bus transmission systems An electrically and mechanically modular design of a high impedance, passive tap is disclosed for use in distributed, serial transmission systems to provide a tap connection to the primary transmission line with minimum loading and reflection. The tap is ... | 05/26/1981 |
| 4255742 | Data communication code An encoder of a transmitter converts digital data or analog signal information into an encoded sequence or waveform required by a communication channel. If a plurality of transmitters are to share a common channel or medium, then the correlation propertie... | 03/10/1981 |
| 4212013 | Duplex-transmitter receiver arrangement A duplex-transmitter-receiver arrangement wherein only a single oscillator is utilized for the transmitter and receiver for a digitally modulated radio communication system wherein each location has a transmitter and receiver and a single oscillator is us... | 07/08/1980 |
| 4208630 | Narrow band paging or control radio system The inventor discloses an ultra narrow band relatively ultra stable radio apparatus for communicting paging or control signals from a central transmitter to a multiplicity of remotely located receivers, which receivers may be carried on the person of indi... | 06/17/1980 |
| 4205360 | Power line carrier apparatus Power line carrier apparatus of the on-off type, including a local transmitter and receiver coupled to a transmission line for communication with a remote station. An adjustable attenuator, located between the transmission line and the bandpass input filt... | 05/27/1980 |
| 4203010 | Communication system Data and speech are transmitted along an elongate member from a transmitter to a receiver. Toroids are used to effect a low frequency coupling between the transceivers and the elongate member. The toroids are segmented and their windings are such as to fo... | 05/13/1980 |
| 4145655 | Digitally transmitting transceiver A transceiver has digital transmitting capability. The transceiver includes an antenna having an input for transmitting signals applied thereto. Signal generating means generate first and second signals having first and second frequencies, and transmissio... | 03/20/1979 |
| 4117404 | System of communications to alert police personnel of trouble on expressways A system involving transmitters adapted for mounting on trucks, buses, etc. and capable of energizing at least one transceiver along a highway which in turn sends a signal to a police control station to enable truck drivers to report a disabled vehicle an... | 09/26/1978 |
| 4097809 | Local event broadcast system A system for providing coverage of a local event such as a sporting event for the spectators thereof includes a plurality of portable radio broadcast receivers to be carried by the spectators. A central control mobile unit provides program material relati... | 06/27/1978 |
| 4097692 | Method and apparatus for the two-way transmission of pulses In a method and apparatus for the two-way transmission of pulses between a plurality of out-stations generally connected to a common power supply network and at least one control unit, the data is applied to the power supply network using pulse code modul... | 06/27/1978 |
| 4086534 | Circuit for wire transmission of high frequency data communication pulse signals A transceiver (transmitter-receiver) for high frequency data pulse signals is connected to a coaxial cable transmission line through a distributed delay line which has an impedance equal in value to the characteristic impedance of the coaxial cable transm... | 04/25/1978 |
| 4085287 | Data transmitting apparatus This data transmitting apparatus is illustrated in a system for the remote reading of water meters. It includes a passive transmitter operated by the meter, a receiver including a source of energy, and means for connecting the receiver and its energy sour... | 04/18/1978 |
| 4071887 | Synchronous serial data adaptor An integrated circuit synchronous data adaptor (SSDA) provides a bidirectional interface for synchronous data interchange. Internal control and interface logic including first-in-first-out (FIFO) buffer memory enables simultaneous transmitting and receivi... | 01/31/1978 |
| 4044307 | Data modems with automatic equalization, drop-out detection and data echo protection Disclosed is an automatic data communication system having communicating modems equipped with automatic equalizers. The equalizers respond to a first long equalization sequence automatically transmitted from another modem. In response to that long equaliz... | 08/23/1977 |
| 4038601 | Device for connecting peripheral units to a line for transmitting data by pulse code modulation The invention relates to a device for connecting peripheral units to a line for transmitting data by pulse code modulation. The transmitter/receiver of such unit is connected to the line through a three-winding insulating transformer having its windings c... | 07/26/1977 |
| 4034294 | Overlap PCM coder/decoder with reaction time compensation A PCM coder/decoder circuit is disclosed employing a counter that counts clock pulses until a transmitting ramp voltage equals that of an outgoing speech sample. The encoded count is transmitted in complemented form to the distant station where it is even... | 07/05/1977 |
| 4032884 | Adaptive trunk data transmission system An adaptive trunk data transmission system in which data bits to be communicated are not transmitted during certain fade durations of a multi-channel propagation characteristic, but are delayed instead, until the fade interval is over, when they are then ... | 06/28/1977 |
| 4017799 | High speed multiplex data transmission system 5. A high-speed data transmission system comprising a central station, a plurality of control positions connected to said central station, a transmitter connected to said central station, an individual mobile station for each of said positions, means at s... | 04/12/1977 |
| 4009356 | Data modems having data drop-out and data echo protection Disclosed is an automatic data communication system having communicating modems equipped with automatic equalizers. The equalizers respond to a first long equalization sequence automatically transmitted from another modem. In response to that long equaliz... | 02/22/1977 |
| 3979676 | Delta modulation apparatus Disclosed is a digital modem using continuously variable sloped delta modulation and adapted for digitizing voice signals in a telephone system. In the analog to digital direction (A/D), an analog input signal is converted into a digital output, the outpu... | 09/07/1976 |
| 3973170 | Intrinsic safety barrier A data communication system for an industrial plant includes a plurality of communication stations which are interconnected by a coaxial cable that is required to pass through one or more hazardous areas. The communication stations are energized from a so... | 08/03/1976 |
