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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.... |
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4771451 |
Polarity ring director
A polarity ring director for designating a specific party in a multi-party telephone system using polarity encoding to ring only a specific party's telephone includes a solid state bipolar switch... |
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4761810 |
Programmable selective ringing circuit and method for party telephone line
An apparatus and method for decoding ringing signals on a party telephone line coupled to the telephone line and a telephone instrument, according to the polarity of a d.c. voltage level present... |
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4741024 |
Selective ringing circuit for a telephone
A selective ringing circuit for a telephone line includes a rectifier which is normally connected to the telephone line for rectifying the AC ringing and other signals. The rectified ringing... |
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4723271 |
Apparatus for selectively alerting party line subscribers
An apparatus is described having the capability to selectively alert subscribers in a telephone party line system where different subscriber parties are alerted using different ringing... |
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4701949 |
Frequency responsive party telephone line selection apparatus and method
An apparatus adapted to be coupled into a party telephone line for selecting a ringing signal transmitted on the line from among a plurality of possible coded ringing signals that could be... |
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4669111 |
Polarity ring director
A polarity ring director for designating a specific party in a multi-party telephone system using polarity encoding to ring only a specific party's telephone includes a solid state bipolar switch... |
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4587380 |
Interface for connecting standard telephones to party lines
A party line interface for permitting the connection of a standard telephone to a telephone central office which rings selected subscribers by applying a DC ringing potential of a selected... |
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4435619 |
Switching network interfacing telephone-exchange equipment with two-subscriber party line
A line loop (a, b) serving two telephone subscribers with sets (U1, U2) each normally connected between ground and a respective line conductor, coupled at the exchange via a line transformer (T)... |
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4224476 |
Multiparty subscriber loop carrier systems
A subscriber loop carrier system is disclosed in which a plurality of telephone subscriber communications channels are frequency-multiplexed on a single wire pair using analog modulation... |
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3965307 |
Electronic tone ringer
An electronic tone ringer for use in telephone subsets. Operating in response to and powered from incoming received ringing signals, the ringer circuitry provides audible multitone signals. The... |
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3790718 |
SOLID STATE DIAL SELECTOR SIGNALLING APPARATUS
The invention comprises a separate signalling apparatus for use with a party line communications system to signal the called party. Each station includes a dial selector interconnected to all... |
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3662116 |
SUBSCRIBER SUPERIMPOSED SIGNALING UNIT
Ringing control tone is provided to operate the ringing circuit of any one of a plurality of party line subscribers. Ringing depends upon operation of control relays which direct signals with a... |
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3624305 |
COMMUNICATION SWITCHING NETWORK HOLD AND EXTRA CONTROL CONDUCTOR USAGE
A common control switching system with a network having a main section for line to line and trunk connections and an auxiliary portion for register and sender connections. The terminal stage of... |
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3530253 |
PARTY LINE CIRCUIT USING DIODES IN RINGING CONTROL,LOCKOUT,AND REVERTIVE CALLING
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RE09749 |
Title is not available
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3303289 |
Telephone station apparatus
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3284576 |
Telephone line circuit
1,052,556. Automatic exchange systems; circuits employing bi-stable magnetic elements; semi-conductor switching circuits. WESTERN ELECTRIC CO. May 28, 1964 [June 4, 1963], No. 22047/64. Headings... |
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3247327 |
Telephone signalling circuits
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3235669 |
Telephone signalling circuits
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3071653 |
Power supply system
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3033932 |
Selective ringing multi-party telephone system
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2863952 |
Electric selective signalling systems
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2854651 |
Diode circuits
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2830124 |
Electronic telephone system
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2763726 |
Telephone ringing-signal transmission system
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2666812 |
Telephone signaling system
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2654804 |
Power line carrier telephone system
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2641653 |
Ringer circuit using cold cathode tube
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2592813 |
Automatic telephone system provided with party lines
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2583782 |
Party line connector circuit for code ringing
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2571250 |
Party line selective signaling system having code call
666,500. Automatic exchange systems. AUTOMATIC ELECTRIC LABORATORIES, Inc. Nov. 15, 1948 [Dec. 30, 1947], No. 29619/49. Class 40 (iv). An automatic telephone system has two groups of two-party... |
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2388071 |
Selective ringing telephone system
SThis invention relates to telephone systems and has for its object to increase the capacity of existing dial telephone exchanges with the minimum of labor and -expense. War time restrictions... |
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2268880 |
Telephone system
In distant communication systems, more particularly telephone systems, it is known to use various ringing currents, for example alternating current of different frequencies, for selectively... |
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2250770 |
Telephone system
The invention relates to a circuit arrangement for party lines in remote signalling in particular telephone installations, and represents a further development of the arrangement in the German... |
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2250264 |
Telephone ringing system
This invention relates to selective signaling systems and more particularly to selective ringing systems for telephone lines in which threeelectrode cold cathode gas tubes are employed and so... |
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2249778 |
Title is not available
This invention relates to selective signaling systems and more particularly to selective ringing systems for two-party telephone lines. It is common practice in two-party telephone line circuits... |
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2249154 |
Telephone ringing system
This invention relates to selective signaling systems and more particularly to selective ringing systems for telephone lines in which threeelectrode cold cathode gas-filled tubes are employed and... |
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2240339 |
Telephone signaling system
This invention relates to a telephone signaling system, with more particular reference to the type of telephone circuit employed in what is known as the superimposed system of ringing where a... |
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2236798 |
Telephone system
The invention relates to a circuit arrangement for distance communication in particular telephone installations with party lines in which a selection is accomplished by impulses in alternative... |
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2236797 |
Telephone system
The invention concerns the telephone systems having party lines; more particularly, it relates to sending devices at the exchange which, under the influence of dial impulses, send out station... |
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2209022 |
Telephone system
The invention relates to a circuit arrangement for remote control systems and more particularly for telephone systems with party lines and central control stations. In such systems the restoration... |
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2195417 |
Vibrating piezoelectric relay
520,267. Electric tests. STANDARD TELEPHONES & CABLES, Ltd. Oct. 28, 1938, No. 31244. Convention date, Nov. 10, 1937. Drawings to Specification. [Class 37] [Also in Groups XXXVII, XXXIX and XL], A... |
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2188520 |
Party line telephone system
For simplifying the service for subscribers in remote communication systems, and more especially in telephone systems, arrangements have been known which register a call proceeding from a... |
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2186315 |
Telephone system
The invention relates to a circuit arrangement for remote communication systems and more especially for telephone systems with party lines, in which selection is effected by the kind of selecting... |
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2176321 |
Telephone system
The invention relates to a circuit arrangement for remote control systems and more particularly for telephone systems-having party lines whose branch stations are equipped with switches (stepping... |
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2164033 |
Telephone system
This invention relates to telephone systems and particularly to systems having multi-station subscribers' lines. 'The objects of the invention are to facilitate the making of a simple and positive... |
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2157848 |
Telephone system
The present invention relates to telephone systems in general, but is concerned more particularly with telephone systems of the magneto party line type. The principal feature of this invention is... |
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2088311 |
Telephone ringing system
This invention relates to selective signaling systems and more particularly to selective ringing systems for telephone lines. The object is to improve and simplify systems of this character.... |
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2069915 |
Signaling system
This invention relates to signaling systems and mori particularly to signaling systems which are capable of producing a variety of different signals as desired. The arrangements of the invention... |