Quotables
"What, sir, would you make a ship sail against the wind and currents by lighting a bonfire under her deck? I pray you, excuse me, I have not the time to listen to such nonsense."
Napoleon Bonaparte ; When told of the Robert Fulton steamboat
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7110530 | System and method for providing universal access to voice response systems A present invention comprises a device and method for monitoring dial pulse (DP) signals on a line and recognizing a digit pattern comprising at least one digit on the line. In response to the recognized digit pattern, the invention determines when to initiate trans... | 09/19/2006 |
| 7082123 | Silent redial system for VoIP modem A redial system for a VoIP modem includes a subscriber line interface circuit (SLIC) for interfacing analog telephone signals from a telephone set to the VoIP modem and for generating redial signals to a public switched telephone network (PSTN), a first relay for co... | 07/25/2006 |
| 7006623 | Circuit for reducing voltage peak in interfacing with a telephone line According to an embodiment, a DC driver circuit is coupled to a tip/ring line. The DC driver circuit includes a first capacitor coupled to a first switch where the first switch is coupled to an amplification circuit. An RC circuit is coupled to a second switch where... | 02/28/2006 |
| 6914978 | Pulse dialing system for VoIP modem A pulse dialing system for a VoIP modem includes a subscriber line interface circuit (SLIC) for interfacing analog telephone signals to digital signals, a relay for selectively connecting a telephone set with a public switched telephone network (PSTN) or with the SL... | 07/05/2005 |
| 6674846 | Method and system for modem pulse dialing in a telecommunication system The method and system determines if modem pulse dialing has been requested in a telecommunication system having both a modem and an associated modem driver. When modem pulse dialing is requested, a fast timer is activated by the modem driver in associatio... | 01/06/2004 |
| 6671315 | DTMF signal generator A DTMF signal generator simplifies frequency characteristic design of a telephone line interface so as to make it easy to carry out alteration of a low tone group frequency component and a high tone group frequency component of a DTMF signal, and to lower... | 12/30/2003 |
| 6525579 | Pulse translational circuits In a circuit for producing output pulses which correspond to pre-selected voltage pulses occurring in an input signal train; means connected to derive from said input signal train a succession of unidirectional pulses, at least some of which pulses occur ... | 02/25/2003 |
| 6366669 | System and method for providing universal access to interactive voice response systems A system and method for allowing callers using DP telephones to access IVR systems, including monitoring DP signals until a dialed digit is recognized, where the DP signals are generated by a transmission element and received by a reception element within... | 04/02/2002 |
| 5889853 | Adjustable-period dual-tone multifrequency generator An adjustable-period dual-tone multifrequency (DTMF) generator, which includes a plurality of programmable counters or up/down counters, a control unit, a memory unit for storing data, a digital adder, and a digital-to-analog converter. The programmable c... | 03/30/1999 |
| 5754645 | Electronic apparatus having keyless control The method and apparatus of the present invention permits data entry in an electronic apparatus without using a keypad. By rotating a moveable element (104), a function, letter, or number is selected. The moveable element (104) is then moved in another di... | 05/19/1998 |
| 5706340 | Telephone apparatus including circuit for producing dial data from serial key data A serial data generating circuit and a key input signal generating circuit are provided at a panel substrate side, and input key data are transmitted in series to a main substrate side of a telephone apparatus. The number of signal lines connected between... | 01/06/1998 |
| 5444775 | Telephone key selection aid A locator aid for identifying and permitting the actuation of the number "9" and "1" keys of a rotary or touch telephone keyboard. Each locator includes a base which is fixedly positioned with respect to the telephone, an elongated guide strip, and an int... | 08/22/1995 |
| 5425096 | Communication device A circuit for generating dial pulses and a circuit for forming the direct current loop of a line have conventionally been made up of relays and a coil. In the present invention, these circuits are made up of components, such as capacitors and a semiconduc... | 06/13/1995 |
| 5400398 | Electronic telephone set with low power hook switch A subscriber set includes two line terminals, and electronic telephone set circuit, and a hook switch for switching the line current. A microswitch may suffice because the subscriber set comprises a series combination of a main current path of a first tra... | 03/21/1995 |
| 5398031 | DTMF signal generating circuit A DTMF signal generating circuit for producing output of a selection signal having a frequency corresponding to a signal entered from push buttons. A high frequency oscillation signal output from an oscillatory circuit are delivered to both a first freque... | 03/14/1995 |
| 5317634 | Telephone subset arrangement A telephone circuit subset arrangement in which the base/emitter junction of a switching transistor (TR1) coupling an internal battery (B1) to the dialler chip's power terminals (VDD, VSS) is shunted by hook-switch signal contacts (HS) when the subset is ... | 05/31/1994 |
| 5280522 | Circuit for transmitting voice signals and dial pulses A signal transmission circuit of a telephone system comprises a photo-transistor with its emitter and collector connected to telephone network lines, respectively. First and second relays are disposed, respectively, in the telephone network lines between ... | 01/18/1994 |
| 5253290 | Circuit arrangement for the transmission of telecommunication signals A connecting line is provided between a switching center and a subscriber for transmission of telecommunication signals. At the subscriber's end of the connecting line, there is located a device which, in addition to other passive and active units, includ... | 10/12/1993 |
| 5241591 | Telephone system having a dial data changeover switch A telephone system having a dial data changeover switch transmits either a dial pulse signal or a dual-tone multifrequency signal along a telephone line. This telephone system includes a changeover switch for changing between a KEY signal from a key board... | 08/31/1993 |
| 5235635 | Keypad monitor with keypad activity-based activation A keypad monitor which monitors the condition of a plurality of switches of a keypad is activated in response to receiving clock signals from an external clock source and is deactivated in the absence of the clock signals. The keypad monitor includes a ke... | 08/10/1993 |
| 5220597 | Dialing apparatus for power failure extension telephone set of key telephone system Disclosed is a dialing apparatus used for a power failure extension telephone set 30 in a key telephone system. The power failure extension telephone set 30 is driven by power supplied from a key service unit 2 so as to function as an extension telephone ... | 06/15/1993 |
| 5216710 | Liquid crystal display driver and power supply A liquid crystal display driver and power supply for use with a telephone dialing circuit reduces the potential of an external power supply to the telephone dialing circuit to a desired voltage level. The reduced potential is then stabilized and a second ... | 06/01/1993 |
| 5121425 | Telephone transmission circuit with improved switching device A circuit arrangement of simple structure for producing dialing pulses for a telephone transmission system so as to provide a relatively low insertion attenuation during transmission. The impedance of the transmission system should not be reduced. At loop... | 06/09/1992 |
| 5105461 | Telephone line interface circuit A telephone line interface circuit for connecting telephone equipment provided with internal speech lines having predetermined DC impedance to external telephone lines, comprising a rectifying circuit connected with the telephone lines for rectifying the ... | 04/14/1992 |
| 5042066 | Dialer circuit A dialer circuit equipped with built-in dialer memories for auto-redial or abbreviated-dial telephone communication and operable to send out a DTMF signal or a pulse signal to a telephone circuit based on a key input signal. A battery voltage is supplied ... | 08/20/1991 |
| 5031212 | Dialer circuit A dialer circuit comprising a microcomputer for controlling the dialing of a telephone. This dialer circuit is capable of storing a telephone number and transmitting a signal concerning this telephone number to a telephone circuit according to a given com... | 07/09/1991 |
| 4998276 | Dial signal generator for generating dial pulse signal and dual tone multi-frequency signal A dial signal generator supplied with dial data corresponding to a dial number, includes a dial data register for storing the dial data, a decoder for decoding the dial data supplied from the dial data register to thereby generate corresponding row and co... | 03/05/1991 |
| 4944000 | Semiconductor integrated circuit for a telephone dialer including a wait-pause circuit The dialer IC according to the present invention is capable of expanding an access-pause of the push-button telephone and adapting itself to a wide variety of dialing services.... | 07/24/1990 |
| 4887295 | Telephone instrument Telephone instruments generally comprise a mechanical hookswitch connected across the pair of speech wires. This specification discloses solid state hookswitch circuitry comprising a switching transistor controlled by a hookswitch and connected in series ... | 12/12/1989 |
| 4800585 | Saturating bipolar switch circuit for telephone dial pulsing A digital telephone set dial pulsing circuit in which the line current switching element is a bipolar transistor. To keep such switching transistor constantly in the saturated state irrespective of the magnitude of the line current, its base is driven by ... | 01/24/1989 |
| 4776008 | Key-in sound-generating circuit A key-in sound-generating circuit comprises a keyboard including dial number keys and function keys, a DTMF signal generator coupled, at the output terminal, with a telephone network, a sound generator for converting, into a sound, the output signal from ... | 10/04/1988 |
| 4727571 | Circuit for surge voltage protection in electronic telephone stations A circuit for surge voltage protection of therefor a telephone station has first and second input terminals for receiving a DC supply voltage via a two-wire subscriber line. Both terminals are shunted via a varistor. In parallel with the varistor is an el... | 02/23/1988 |
| 4636588 | Electric source circuit for telephone sets An output voltage of a first diode deriving out an office line voltage, and an output voltage of a second diode deriving out the voltage of a back-up battery are combined and then smoothed by a smoothing capacitor. The smoothed voltage is supplied to a co... | 01/13/1987 |
| 4564726 | Pulse/direct current transmitting circuit in a key telephone system A pulse data signal and a DC power signal are transmitted over a pair of transmission lines interconnecting a main operating unit and telephone sets in a key telephone system. The main operating unit and each telephone set includes a pulse transmitting an... | 01/14/1986 |
| 4536614 | Supervision and dial pulse detection circuit for a telephone subscriber line A floating battery feed circuit employs a single primary winding, a pulse width control circuit and a peak detector for providing a controlled current to a subscriber loop. The amplitude of the controlled current is determined by the loop resistance. A co... | 08/20/1985 |
| 4403116 | Telephone apparatus The body for a telephone unit is designed to permit easy removal for maintenance and for initial assembly. The escutcheon plate which is a close fit to the dial is fitted in an oval hole which allows it to move on the body to clear the dial on removal of ... | 09/06/1983 |
| 4388499 | Line interruption circuit for use in a telephone set A circuit comprising a line interruption arrangement for producing dial pulses, comprising a series arrangement of a semiconductor switching element and a control device connected between a first and a second line terminal, the first and second terminals ... | 06/14/1983 |
| 4306119 | Telephone outpulsing circuit In a telephone system wherein a polarity reversible dc voltage is provided by a central office, a telephone outpulsing circuit utilizing field-effect transistors (21-24) performs the additional function of a polarity guard. Arranged in a rectifying config... | 12/15/1981 |
| 4286120 | Current regulated pulse dialer circuit A current regulated pulse dialer circuit for use in a loop powered pulse dialing telephone. A current source is connected to an electronic pulse dialer to provide high impedance across a telephone line during transmission and interpulse pause conditions.... | 08/25/1981 |
| 4223186 | Circuit arrangement for line-supplied subscriber stations having dial devices A circuit arrangement for subscriber stations which are supplied by way of subscriber lines and which have dial devices and voice circuits employ, in order to minimize the insertion lost during the voice mode, current feed to the dial device by way of a d... | 09/16/1980 |
