Did You Know...
...that the Eveready Battery began as an invention called the "electric flowerpot," which was a tube with a battery and light bulb inside? The idea was to fasten this gizmo to the side of a flowerpot so it would illuminate the flowers from the bottom. The idea died on the vine and the businessman who licensed the flower pot, Conrad Huber, was left with a pile of useless tubes -- until he found a way to market them as batteries to light the world!
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| Number | Title | Issue Date |
| 8204208 | Priority telephone service reversion and notification A method of administering a priority service is provided in a telecommunications network (20). The priority service provides higher priority handling of calls employing the service as compared to calls not employing the service for purposes of call completion... | 06/19/2012 |
| 6928158 | Transmission of a clock by a capacitive isolating barrier A method and a circuit for regenerating a clock signal based on a flip-flop and on two complementary signals at the clock rate, the flip-flop being assembled as a divider by two of a combination of shaping signals each translating a direction, respectively rising or... | 08/09/2005 |
| 5822424 | Dial pulse detector and detecting method for paging service for mechanical telephone subscriber A dial pulse detector in a paging system for rendering a paging service for a subscriber who uses a mechanical telephone includes a delay correlativity calculator for receiving dial pulses generated by predetermined pre-test dialing digits dialed by the s... | 10/13/1998 |
| 5610978 | Ring discriminator A ring discriminator comprised of apparatus for receiving an input ringing signal, a counter, apparatus for applying clock pulses to the counter, apparatus for enabling the counter to count clock pulses from a cycle of ringing current, and apparatus for d... | 03/11/1997 |
| 5359650 | Digital circuit for conditional initialization The invention relates to remotely powered circuitry, and in particular to telephones. The circuit of the invention uses a counter to measure or compare the duration of power supply interruptions on the remote power supplying line to cause the remotely pow... | 10/25/1994 |
| 5144652 | Device for connecting a subscriber line to a selected internal line Device for connecting one out of a plurality of internal lines (34,36) to an information exchange subscriber line, such as a telephone, facsimile or telex line, provided with decoding means (28,1-16) to detect dialling disc pulses (a), preferably on base ... | 09/01/1992 |
| 5010569 | Telephone-call distributor In a telephone-call distributor of the present invention, a dial data signal to be transmitted is generated by a control unit (1301, 2301, 3301) and DTMF signal generator (1328, 3328) in accordance with the dial data given to the control unit through a DT... | 04/23/1991 |
| 4924501 | Dial pulse selection A dial pulse detection system 20 has an analogue input buffer 22, an analogue to digital converter (ADC) 24, a processor 25, and an output buffer 26. Processor 25 operates on the digitally encoded samples produced by ADC 24 from the received signal to ach... | 05/08/1990 |
| 4839920 | Method for determining telephone dial pulse parameters independently of subscriber line length A method is disclosed for measuring telephone dial pulse parameters independent of telephone subscriber line length. To avoid distortions resulting from varying subscriber line lengths, there is performed during the first pulse interval of a dial pulse se... | 06/13/1989 |
| 4782520 | Pulse receiver circuit providing longitudinal balance A pulse receiver for connection in a telephone circuit including two coils connected between a voltage potential and ground further including an external impedance that is alternately connected between the coils. The pulse receiver includes a first impeda... | 11/01/1988 |
| 4590432 | Constant-percent break pulse corrector Constant-percent break interval pulse correctors insure that the break interval of a dial pulse subsists for a substantially constant percentage of the total pulse interval; i.e., break interval plus make interval. The constant-percent break interval puls... | 05/20/1986 |
| 4567330 | Interface for connecting standard telephones to party lines A party line interface for permitting connection of a standard two-wire telephone designed for non-party line use to a party line system which rings subscribers by party line ringing signals of different frequencies. The interface includes circuitry for g... | 01/28/1986 |
| 4563547 | Loop-start/ground-start line interface circuit A switchable common mode reference circuit for tip conductor and ring conductor line feed amplifiers provides a tip-ring common mode feedback reference for loop-start operations and a common mode fixed bias for ground-start operations. The functioning of ... | 01/07/1986 |
| 4555599 | Signal transmission devices A signal transmission device capable, for example, of use as a hybrid circuit in a voice frequency telephone transmission system, comprises a controllable substantially load independent current source shunting a signal path between input and output ports ... | 11/26/1985 |
| 4555593 | Electronic telephone relay An electronic relay circuit for replacement of an A-type relay in a step-by-step selector and connector of a telephone exchange system is implemented with a first operational amplifier (10) connected to the tip (T) and ring (R) conductors of a telephone l... | 11/26/1985 |
| 4501932 | Solid state electronic dial pulse receiver circuit An electronic switch for use in the tip and ring circuit of a rotary dial telephone pulsing system is disclosed. The electronic switch is a functional replacement for a single pole, double throw electromechanical pulsing relay having normally open and nor... | 02/26/1985 |
| 4429186 | Floating battery feed circuit for telephone subscriber line interface An arrangement for providing a subscriber line with an operating potential. The energy to the line is transferred thereto inductively at a fixed frequency and includes the rectification means on the subscriber side of the inductor. The amount of energy tr... | 01/31/1984 |
| 4413159 | Dial pulsing circuit In order to provide push-button telephone service to those telephone systems not equipped to respond to multifrequency dialing signals, it is necessary to convert push-button dialed digits into conventional dial pulses. A pulse train consisting of make an... | 11/01/1983 |
| 4347406 | Pulse detector circuit A circuit which detects specific pulses superimposed on noise and other pulse signals. Threshold detecting comparators are used to discriminate between class of service pulses, noise pulses and other supervisory signals.... | 08/31/1982 |
| 4326105 | Dial pulse detector A dial pulse detection circuit for partial correction of grossly distorted line current dial pulses, which provides square wave output signals for use by later timing detection circuitry. To detect such dial pulses, the present invention establishes an up... | 04/20/1982 |
| 4320265 | Line repeater for telephone system using radio links A telephone exchange communicates with a number of scattered local stations via radio links extending from a central terminal to respective peripheral installations each comprising a radio transceiver coupled via a repeater to the line loop of an associat... | 03/16/1982 |
| 4319091 | Dial pulse restorer A dial pulse restorer for receiving and restoring telephone dial pulses which may be distorted, and also for discriminating telephone-hang-up pulses which may be applied to a telephone line when a remote telephone coupled to the telephone line hangs up. A... | 03/09/1982 |
| 4289933 | Dial pulse detection The disclosure shows a telephone range extender which is automatically adaptable to the length of the connected subscriber loop. A loop resistance detector within the range extender discriminates between loops within a plurality of ranges of lengths. For ... | 09/15/1981 |
| 4278842 | Circuit for eliminating spurious pulses in a dial pulse stream A digital logic circuit for eliminating spurious transient pulses (21, 32) from among genuine pulses (51) in a binary dial pulse stream. The dial pulse stream is coupled to the circuit input (46). Output (47) is prevented from matching the input unless th... | 07/14/1981 |
| 4266099 | Pulse rejection and duration correction circuit A circuit which is particularly adapted for reconstructing fixed time duration dialing pulses in a telephone communications system while rejecting spurious pulses of less than a selected pulse duration. The circuit utilizes two coupling networks having in... | 05/05/1981 |
| 4242636 | Digital operate/release timer Operate/release timing circuits are employed to generate time delayed pulse signals, for example, dial pulses, wink signals and other supervisory signals employed in telecommunications signaling systems. Pulse position and pulse width errors and other pro... | 12/30/1980 |
| 4230912 | Dial pulse sensor and repeater circuit A line voltage sensor and dial pulse repeater circuit for use in conjunction with a digital PABX telephone system connecting a subscriber station to a switching center providing for detection of off-hook condition of the subscriber's set, detection of irr... | 10/28/1980 |
| 4227054 | Digital constant-percent break pulse corrector Constant-percent break pulse correctors ensure that the break interval of a dial pulse signal subsists for a substantially constant percentage of the total dial pulse interval, i.e., break interval plus make interval. The pulse corrector also delays via a... | 10/07/1980 |
| 4223184 | Minimum break/make pulse corrector Pulse signals, for example, dial pulses, wink signals or the like, have been corrected to have minimum break and make intervals by employing at least two analog resistor/capacitor type timers, usually connected in tandem. These prior timer arrangements ar... | 09/16/1980 |
| 4207436 | Constant percent break type dial pulse corrector The first monostable multivibrator of a series connected pair of monostable multivibrators is responsive to each break interval of input dial pulses for establishing a fixed time delay after which the second multivibrator initiates a corrected break inter... | 06/10/1980 |
| 4198547 | Pulse circuit for two wire electronic PABX stations A pulse shaping circuit, for use with two-wire telephone station sets, such as normally associated with electronic private automatic branch exchange systems. The function of the pulse circuit is to regenerate hook-switch and hold-button control signal pul... | 04/15/1980 |
| 4188508 | Telephone call restricting apparatus A telephone call restricting apparatus for preventing toll calls and including circuitry for sequentially decoding the signals representing each digit of a telephone number, storing the first seven decoded digit signals in binary and converting the stored... | 02/12/1980 |
| 4118603 | DC signaling circuit for use in conjunction with isolation transformers The present invention relates to a DC signaling circuit operatively associated with a communication system having an isolation transformer interconnected between a central communication exchange center and a station site such as a power substation or gene... | 10/03/1978 |
| 4087644 | Dial impulse relay circuit The disclosure relates to a dial impulse relay circuit including a three-winding relay which repeats a pulse train generated by a first circuit onto a second circuit with substantially no pulse ratio distortion.... | 05/02/1978 |
| 4078159 | Modified duobinary repeatered span line An end-office repeater accepts a high-speed bipolar signal, converts the bipolar signal into a unipolar signal, scrambles the unipolar signal, and encodes the scrambled unipolar signal into a modified duobinary signal for transmission over a cable pair. B... | 03/07/1978 |
| 4071781 | Pulse duration correction circuit A pulse duration correcting circuit comprising a comparator and a bipolar averaging circuit for correcting the duration of incoming pulses to a desired standard value is disclosed.... | 01/31/1978 |
| 4064377 | Electronic hybrid and hybrid repeater An electronic hybrid for coupling signals between two wire and four wire transmission circuits, and capable of meeting the operating requirements of practical telephone systems. The hybrid includes a pair of terminating impedances serially connected betwe... | 12/20/1977 |
| 4046968 | Integrable line circuit for use with miniature line transformer A line transformer circuit in which the DC component of magnetization produced in the tip and ring windings by the battery supplying loop current to the telephone set microphone may be neutralized by an oppositely-poled, serially-connected balancing windi... | 09/06/1977 |
| 4046969 | Dial pulse repeating line circuit using miniature line transformer A telephone line transformer having less iron in its core can be achieved by providing the transformer with a third winding to balance out the DC magnetization produced by the tip and ring windings. This winding must be bypassed by a capacitor of fairly l... | 09/06/1977 |
| 4029907 | Asynchronous digital repeater An asynchronous, regenerative, digital repeater for use in bipolar digital signalling systems includes an amplifier for receiving and amplifying incoming signals, a first monostable multivibrator for producing regenerated pulses responsively to the output... | 06/14/1977 |
