Class 379/168 - Lockout

Subclass of Class 379 - Telephonic communications
Definition: Subject matter which blocks access to the system by stations
No. of patents: 30
Last issue date: 01/01/2008

Number	Title	Issue Date
7315615	Automatic telephone line switch An apparatus (40) and method for switching a customer-premises telephone line (36) between a plurality of local telephone networks (35). The local telephone networks may have different electrical and operational characteristics. Using less than ...	01/01/2008
7224793	Communication set with detection of set function and line condition A description is given of a communication set for connection to a communication line such as a telephone line, which communication set includes means for detecting set functions such as ringing signal detection, and a rectifier circuit which is connected to a common...	05/29/2007
7177410	Local control of call features in a telephone system A residential phone system allows for local control of call features from any phone extension. The phone system may include a microcontroller that communicates along the phone lines at a non-utilized frequency to several extension phones in a residence. The microcon...	02/13/2007
RE39432	Impedance blocking filter circuit An impedance blocking filter circuit is provided for use in telecommunication systems for interconnecting between incoming telephone lines and customer's terminal equipment so as to unconditionally block impedances above 20 KHz due to the customer's terminal equipme...	12/19/2006
7023975	Privacy mode system and method for home network telephone A system and method are provided for controlling communications privacy in a Home Network telephone system. The method comprises: using a gateway to send and receive calls on at least one external telephone line; supplying privacy and public mode bridging options; a...	04/04/2006
6980634	Telephone circuit controller apparatus A controller selectively connecting and disconnecting extensions from a telephone line includes a plurality of extension connector ports selectively connected to a communication device and a plurality of relay switches. Each relay switch has three terminals and a to...	12/27/2005
6965672	Electronic switching system An electronic switching system, comprising a common source of voltage to a plurality of user stations connected in parallel, an electronic means of connection to electrically connect a chosen user station to the common source of voltage, and a means of disconnection...	11/15/2005
6882716	Local control of call features in a telephone system A residential phone system allows for local control of call features from any phone extension. The phone system may include a microcontroller that communicates along the phone lines at a non-utilized frequency to several extension phones in a residence. The microcon...	04/19/2005
6539085	Automatic phone line re-allocation For single line telephone service, let red/green denote a pair that is connected to the central office, and yellow/black denote an unused pair, but which also appears at the connections to the subscribers equipment. Any computer or other device that is to...	03/25/2003
6456715	Connecting a telephone A computer system is used with a telephone that is operable by a user to furnish a predetermined command. The processing unit and a control circuit. The central processing unit is connected to communicate with the interface port, and the control circuit i...	09/24/2002
6359977	Telephone port with automatic detection and secure A method and system for automatically detecting that a telephone port is being used and securing the telephone line associating with the telephone port, is presented. In one embodiment, a method and system is described for automatically securing a telepho...	03/19/2002
6321094	Access method through radio mobile communication system In a network system including a wireless mobile communications system, when establishing a connection between a wireless mobile terminal and a host computer connected to a stationary network system, the wireless mobile terminal produces a connection estab...	11/20/2001
6181777	Impedance blocking filter circuit An impedance blocking filter circuit is provided for use in telecommunication systems for interconnecting between incoming telephone lines and customer's terminal equipment so as to unconditionally block impedances above 20 KHz due to the customer's termi...	01/30/2001
6178236	Method and system for providing password protection Access is granted to a portion of a computing system, such as to a configuration menu of a telephone system. In order to grant access, a password is received from a user. A variable password is also calculated. The variable password varies with time. For ...	01/23/2001
5991386	Method and arrangement for the connection of multiple terminals to one subscriber line of the telephone network, and a terminal In an arrangement for the connection of two or more terminals (1, 1') to one subscriber line (3) the terminals (1, 1') are connected to a chain so that the connection from the subscriber line (3) to a terminal (1) is further branched (13) to the next term...	11/23/1999
5978461	Telephone switching system with internal and external channel A telephone switching system is provided for use with an external telephone line and a plurality of telephone extensions wherein each extension has a plurality of "touch tone" buttons which, when depressed, generate an audio signal unique to that button. ...	11/02/1999
5861823	Data entry device having multifunction keys A data entry device is provided, having as its primary function the entry of numeric data. A secondary function is the entry of alphabetic characters. The device is operated with a single hand and requires no shift or function keys. The number of keys of ...	01/19/1999
5832057	Lockout device for preventing telephone eavesdropping from an extension device, and method Remote telephone coder 10R and local telephone coder 10L provide coding and decoding for voice communication between remote telephone set 11R and local telephone set 11L through telephone line 12. An eavesdropper listening in on a listening device such as...	11/03/1998
5765106	Authorized cellular telephone communication access and verification control system This invention relates to a cellular telecommunications systems that utilizes encryption and employs encrypted seed number signals to make it more difficult to make unauthorized cellular telephone calls....	06/09/1998
5566233	Communication controlling apparatus for a single-line telephone with extensions thereto In a single-line telephone, there are a plurality of extension telephone sets connected by a telephone line and each extension telephone set is connected to a communication controlling apparatus. The communication controlling apparatus includes an alterna...	10/15/1996
5559873	Telephone privacy device with conference and indicator features A simple and inexpensive telephone exclusion or privacy device. A conference feature is and am indicator light showing when the line is in use are also provided. The basic exclusion or privacy circuit includes only eleven components, thereby providing a v...	09/24/1996
5402482	Ring trip deciding circuit A ring trip deciding method in a ring trip circuit detects voltage change in the on-hook state and the on-hook state of a terminal when the terminal such as telephone set connected to the telephone line is called. The ring trip deciding circuit has a ring...	03/28/1995
5384838	System for communicating through partitions An intercommunication system for transmitting signals through a door, and having piezo transducer devices mountable on each side of the door, a matrix of analog switches connecting the piezo transducer devices to the input and output of a bridge amplifier...	01/24/1995
5228078	Two-wire intercom with hands-free function An intercom system for a door and inside stations has a speech function for two-way communication with hands-free operation. The intercom system includes a two-wire connecting lead between the door station and each inside station to transmit a conversatio...	07/13/1993
4899372	Multi use telephone extension control circuit and device providing lockout for privacy A circuit/device that can be designed into new telephone subsets as well as connected to existing telephones to prevent unwanted telephone extensions from interfering with the controlling extension. The device is operated by a single push-button located o...	02/06/1990
4377726	Selective paging and intercommunication system A battery powered paging and intercommunication system for application in a mine or other environment where it is necessary to conserve battery power comprises a plurality of transceivers electrically coupled to a common pair of signal lines. Each of the ...	03/22/1983
4132869	Intercommunication system An intercommunication system in which a plurality of stations are interconnected by a single common line and each station is set to receive signals within a voltage "window" different from that of all the other stations of the system, and is operable to t...	01/02/1979
4039759	Line security device A line security device adapted for use in a conventional telephone instrument including a Zener diode tied by its cathode to the high, or the Tip, lead within the instrument, the anode of the Zener diode controlling, across a resistor, the base of a first...	08/02/1977
4010332	Link circuit for intercom unit An intercommunication link for a multiple link key telephone system with a combination lamp-button on each handset for each available link. In each link, a line seeking intercom service is sensed to operate a relay in the link selected. A lamp flash signa...	03/01/1977
3931478	Telephone intercommunication system provided with a common communication line to which access is guarded A private telephone intercommunication system including facilities for connecting the system to a telephone central office. Means are included and restrict internal calls to only two stations to insure privacy....	01/06/1976

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Class 379/168 - Lockout