Matches 1 - 50 out of 142 1 2 3 >


Match Document Document Title
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....
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...
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...
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...
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...
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...
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...
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...
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)...
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...
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...
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...
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...
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...
3530253 PARTY LINE CIRCUIT USING DIODES IN RINGING CONTROL,LOCKOUT,AND REVERTIVE CALLING  
RE09749 Title is not available  
3303289 Telephone station apparatus  
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...
3247327 Telephone signalling circuits  
3235669 Telephone signalling circuits  
3071653 Power supply system  
3033932 Selective ringing multi-party telephone system  
2863952 Electric selective signalling systems  
2854651 Diode circuits  
2830124 Electronic telephone system  
2763726 Telephone ringing-signal transmission system  
2666812 Telephone signaling system  
2654804 Power line carrier telephone system  
2641653 Ringer circuit using cold cathode tube  
2592813 Automatic telephone system provided with party lines  
2583782 Party line connector circuit for code ringing  
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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....
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...

Matches 1 - 50 out of 142 1 2 3 >