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 |
| 7231211 | Apparatus and method for monitoring a trunked radio communications system The present invention provides a method and apparatus for monitoring a trunked radio communications system by using some type of radio scanning receiver that is not designed for that purpose. In addition, the invention provides a method for automatically determining... | 06/12/2007 |
| 7103674 | Apparatus and method of reducing dataflow distruption when detecting path maximum transmission unit (PMTU) A method, system and apparatus for reducing dataflow disruption when increases in path maximum transmission unit (PMTU) are being detected are provided. Conventionally, when increases in PMTU are being detected, an increased-in-size data packet is sent by a transmit... | 09/05/2006 |
| 6744880 | Method for creating a telephone digital switching platform A method for creating a telephone digital switching platform to provide conversion and routing of telephone calls arriving on a number of telephony interfaces to a number of outbound telephony interfaces, based on in parameter and out of parameter call setup informa... | 06/01/2004 |
| 6574661 | Integrated proxy interface for web based telecommunication toll-free network management using a network manager for downloading a call routing tree to client A Web/Internet based toll-free network management tool that enables customers of telecommunications network providers to modify the configuration of their toll-free networks via a Web/Internet-based graphical user interface. The tool provides customers We... | 06/03/2003 |
| 6366664 | Method and system for translating call processing requests A generic translator (10) is provided for processing service requests sent by a digit collection client (16). Requests include billing validation (11), call routing (19), call screening (17), account code validation (15) or other services. These requests ... | 04/02/2002 |
| 6275578 | Method and apparatus for providing back-up, in-band signaling in a communications network A method of detecting and recovering from an out-of-band signaling failure in a telecommunications network involves the reprogramming of switching centers to utilize existent inband signaling capabilities to temporarily replace the failed out-of-band capa... | 08/14/2001 |
| 5572578 | Exchange of information between interconnected voice mail systems A voicemail message processing system. A voicemail message is sent to a remote recipient on a remote voicemail system. In response, the remote voicemail system sends an acknowledgment message containing information on the remote voicemail user. This infor... | 11/05/1996 |
| 5533111 | System for originating and receiving telephone calls over a virtual piped connection, and specialized customer premise equipment for use in the system Access (or egress) charges payable by an IXC to a LEC, and payable by the subscriber to the LEC for originating or terminating calls and for associated vertical call control features, are reduced or eliminated by providing a virtual piped collection that ... | 07/02/1996 |
| 5274696 | Protocol for transmitting messages in a network A method for transmitting voice signals, including user names--alphabetic and/or spoken, and data messages, including network addresses, among sites of a network of store-and-forward messaging system sites using telephone lines. A preferred embodiment of ... | 12/28/1993 |
| 5222129 | Telephone charging signalling detector suitable for central office line interface circuits Detector for telephone charging signalling in the form of periodic pulses derived from alternating current signals at specific frequencies transmitted in analog form by means of a line (2) comprising two wires (A, B), for example to a central office line ... | 06/22/1993 |
| 5206902 | Network signaling arrangement for controlling tandem network functions A facility for establishing a signaling link over a telecommunications network connection formed by a number of network switches is provided so that an upstream switch may communicate with a downstream switch in the connection. The facility is particularl... | 04/27/1993 |
| 5052038 | Apparatus and method for obtaining information in a wide-area telephone system with digital data transmission between a local exchange and an information storage site A telephone system wherein any one of a large number of telephones is connectible to a local directory-assistance request processor. The name of a subscriber whose telephone number is sought is entered through a connected telephone by spelling out the sub... | 09/24/1991 |
| 5020099 | Private branch exchange Instead of setting the type of a dial signal for a central office line connected to a private branch exchange to either a DTMF signal or a pulsed signal externally of the private branch exchange, the line is acquired and a DTMF signal is transmitted from ... | 05/28/1991 |
| 4930153 | PBX voice mail interface An interface is described which attaches between the incoming trunk lines from a central office and a PBX system and which monitors the communication between the central office and the PBX to record the signals representative of telephone extension of a c... | 05/29/1990 |
| 4879743 | PBX and adjunct using multi-frequency tones for communication therebetween A PBX system is responsive to an incoming call which is directed to an adjunct of the system for sending a ringing signal over a station facility to the adjunct. When the adjunct goes off-hook, the system outputs to the adjunct over the station facility m... | 11/07/1989 |
| 4868861 | Trunk dialing converter A digital FSK trunk dialing converter including M and E lead control is disclosed. The dialing converter further includes an FSK detector which is responsive to consecutive half period intervals of a received FSK signal, and a digital signal-to-noise (S/N... | 09/19/1989 |
| 4829562 | Receiver for detecting different fixed frequency signals on a telephone trunkline A signalling receiver has its signal input (E) connected to a central-office trunk (a, b) in a trunk junctor and includes a variable bandpass filter (BP) connected to a clock line (TL). The signal input (E) is connected via an attenuator (DG) to a variabl... | 05/09/1989 |
| 4782509 | Apparatus and method for obtaining information in a wide-area telephone system with multiple local exchanges and multiple information storage sites A telephone system wherein any one of a large number of telephones is connectible to a local directory assistance request processor. The name of a subscriber whose telephone number is sought is entered through a connected telephone by spelling out the sub... | 11/01/1988 |
| 4751696 | CENTREX attendant console interface An interface circuit for transmitting data and voice signals between a CENTREX equipped central office exchange and a remotely located attendant console. The interface circuit includes an analog interface arranged to receive analog voice signals from the ... | 06/14/1988 |
| 4555594 | Telephone interexchange signaling protocol Disclosed are schemes for selecting an interexchange telephone call carrier, selecting a route to the selected carrier, and establishing a call path on the selected route to the selected carrier in a multicarrier environment. Call path establishment from ... | 11/26/1985 |
| 4479188 | Digital detector for a multi-frequency code in an analog signal This disclosure concerns a system for digitally detecting one or more of a plurality of fixed frequencies in an analog signal according to a correlation method, the fixed frequencies occurring in a first group and in a second group wherein a third harmoni... | 10/23/1984 |
| 4385208 | Multifrequency receiver In a multifrequency receiver, a threshold level (VTH) supplied to a group of threshold comparators (105-1 through 105-N) is controllably adjustable by a variable threshold generation circuit (104) in response to received multifrequency signals. As the en... | 05/24/1983 |
| 4311879 | AC Supervisory signal detector circuit An AC supervisory signal detector circuit for use in conjunction with a trunk circuit of a PABX telephone system connected to a telephone central office. Valid AC supervisory signals are detected to the exclusion of noise signals and response time for det... | 01/19/1982 |
| 4254304 | Signal processor for use with a telephone system and a digital transmission line A signal processor is provided for encoding telephone dialing signals received from a telephone system at a transmitting station and transmitted using a digital transmission system to a receiving station for decoding and application to a telephone system ... | 03/03/1981 |
| 4159402 | Means for identifying subscriber lines A telephone office is provided with a dedicated trunk modified to transmit to subscribers lines connected to the same office the multifrequency tones from an out-going sender used to identify the calling party. Provision is made for connecting a subscribe... | 06/26/1979 |
| 4153818 | Telephone multiline signaling using common signal pair A telephone multiline signaling system using a common signal pair of lines for transmitting coded electrical signals for selectively connecting one or more of a plurality of telephone lines to a telephone line or channel located at an operator's console. ... | 05/08/1979 |
| 4153819 | Telephone tone signalling receiver with up-conversion of frequency of tones controlled by word instructions A tone receiver, for receiving audio frequency tone signals typically used in telephone signalling, includes a reference frequency generator and a modulator for up-converting audio frequencies. Telephone network tone signalling is up-converted and coupled... | 05/08/1979 |
| 4133982 | AC supervisory signal detector circuit An AC supervisory signal detector circuit for use in conjunction with a trunk circuit of a digital PABX telephone system interfacing with a central office providing for detection of relatively low frequency AC voltages which may be superimposed upon a DC ... | 01/09/1979 |
| 4076965 | Universal receiver/sender A universal receiver/sender is achieved by providing circuitry having parameters setable by binary data words from the data processing unit of a switching facility. A clock signal generator provides output signals corresponding to respective binary instru... | 02/28/1978 |
| 4053709 | Telephone connector A telephone junctor for interconnecting an electromechanical and an electronic automatic exchange, the latter using tone signaling and capable of operating in time-division-multiplex. The junctor permits direct inward dialing of a subscriber on the electr... | 10/11/1977 |
| 4048451 | Arrangement for monitoring live call disposition signals The reliable detection of call disposition signals to identify the ultimate dispositions of calls switched over a cross-office connection is achieved by attaching monitoring equipment to the sender that has been seized by an incoming trunk circuit of a te... | 09/13/1977 |
| 4048450 | Trunk circuit traffic analyzer Analyzer for monitoring the traffic of a group of trunks conveying decimal code signalling and dialling impulses and multifrequency code signalling and dialling signals. It comprises multifrequency signalling receivers in a number smaller than the trunks ... | 09/13/1977 |
| 4002848 | Toll fraud eliminator for telephone systems A tone detector is connected or otherwise associated with an outgoing telephone trunk line adapted to be included in a toll path. One or more frequency or tone signals are sent over the trunk line for signaling and control during a toll call. If these ton... | 01/11/1977 |
| 4001513 | Method and apparatus for the detection of fraudulent toll telephone calls Fraudulent toll telephone calls are detected by the recognition of extraneous supervisory signals which are generated in the originating office in response to a perpetrator placing such a call. The invention provides a means of detecting a second proceed-... | 01/04/1977 |
| 3997736 | Parallel control of a telephone switching network A switching system is disclosed for interconnecting both the audio and wideband communication leads of communicating telephone stations. The system utilizes an auxiliary switching network separate from the regular audio network for handling the wideband p... | 12/14/1976 |
| 3931476 | Method and system for automatically controlling the connection of inter-city telephone calls at a users facility The specification discloses a system for automatically controlling the connection of inter-city telephone calls between a plurality of input telephone trunk lines at a user's branch exchange and a preset number of output telephone trunk lines. Circuitry i... | 01/06/1976 |
