US3795774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone communication system with auxiliary unit for call tracing
Assignee: Individual
•
Filing: 1971-12-09
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Granted: 1974-03-05
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Expires: 1991-12-09
Abstract
Abstract A telephone communication system has an alarm system that includes an auxiliary unit for locking up the central office equipment involved in a completed telephone call and which is actuatable by the called party by dialing a predetermined number while the communication circuits are complete. A switch responsive to the relay in the called party''s energized circuit is used in sensing pulse signals emanating from the called party telephone to actuate the alarm system and a tone signal responsive relay may also be used. The line locking unit has a self locking relay and appropriately responsive switches that complete circuits for maintaining the sleeve circuits of the parties and other circuits which short out the ring and tip lines of each party to prevent equipment release due to opening of the telephone hook switches. The alarm system contemplates a monitoring system and which is coupled to the talking circuits when the alarm system is actuated.
Inventors
- 👤 E Talbot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:51
CPC Classifications
H; H04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
438 words
A telephone communication system comprising (a) a calling party telephone having a first hook switch, (b) a called party telephone having a second hoOk switch and dialing means, and (c) central office exchange equipment completing a talking circuit between the calling and called party telephones and establishing energized circuits that comprise (1) a calling party loop circuit which includes said first hook switch and first relay means operating under the control of said first hook switch, (2) a called party loop circuit which includes said second hook switch and said dialing means, (3) a calling party sleeve circuit which includes line holding means associated with the calling party telephone and operating to maintain the calling party loop circuit, and (4) a called party sleeve circuit which includes line holding means associated with the called party telephone and operating to maintain the called party loop circuit; said exchange equipment comprising (a) selectable circuit completing control units for controlling the maintenance of respective talking circuits completed between calling and called telephones, and (b) automatic selector means for selecting one of said units, said control units including a selected control unit completing and operating in dependency upon closed conditions of the first hook switch and the second hook switch to maintain said energized circuits , said control unit comprising (a) said first relay means, (b) second relay means operating under the control of said first relay means to maintain the calling and called party sleeve circuits, (c) first switching means actuated by said second relay means and completing the calling and called party sleeve circuits, and (d) capacitance means coupling the calling and called party loop circuits and therewith completing said talking circuit, said dialing means being manipulatable by the called party to generate signals in the called party loop circuit that are respectively associated with the digits in telephone numbers, said system further comprising an auxiliary unit associated with each of said control units and which is actuatable by the called party for controlling the maintenance of the energized calling and called party sleeve circuits, completed through the control unit associated therewith and the auxiliary unit associated with said selected control unit including (a) signal detecting means for detecting said signals in the called party loop circuit, and (b) second switching means connected to the first switching means and actuatable to complete an electrically conductive path in at least one of the sleeve circuits, said path being in parallel with said first switching means therein, and said detecting means being responsive to the detection of a predetermined one of said signals to control the actuation of said second switching means.
Claim 2
Dependent Claim
438 words
A telephone communication system comprising (a) a calling party telephone having a first hook switch, (b) a called party telephone having a second hoOk switch and dialing means, and (c) central office exchange equipment completing a talking circuit between the calling and called party telephones and establishing energized circuits that comprise (1) a calling party loop circuit which includes said first hook switch and first relay means operating under the control of said first hook switch, (2) a called party loop circuit which includes said second hook switch and said dialing means, (3) a calling party sleeve circuit which includes line holding means associated with the calling party telephone and operating to maintain the calling party loop circuit, and (4) a called party sleeve circuit which includes line holding means associated with the called party telephone and operating to maintain the called party loop circuit; said exchange equipment comprising (a) selectable circuit completing control units for controlling the maintenance of respective talking circuits completed between calling and called telephones, and (b) automatic selector means for selecting one of said units, said control units including a selected control unit completing and operating in dependency upon closed conditions of the first hook switch and the second hook switch to maintain said energized circuits , said control unit comprising (a) said first relay means, (b) second relay means operating under the control of said first relay means to maintain the calling and called party sleeve circuits, (c) first switching means actuated by said second relay means and completing the calling and called party sleeve circuits, and (d) capacitance means coupling the calling and called party loop circuits and therewith completing said talking circuit, said dialing means being manipulatable by the called party to generate signals in the called party loop circuit that are respectively associated with the digits in telephone numbers, said system further comprising an auxiliary unit associated with each of said control units and which is actuatable by the called party for controlling the maintenance of the energized calling and called party sleeve circuits, completed through the control unit associated therewith and the auxiliary unit associated with said selected control unit including (a) signal detecting means for detecting said signals in the called party loop circuit, and (b) second switching means connected to the first switching means and actuatable to complete an electrically conductive path in at least one of the sleeve circuits, said path being in parallel with said first switching means therein, and said detecting means being responsive to the detection of a predetermined one of said signals to control the actuation of said second switching means.
Claim 3
Dependent Claim
227 words
A telephone communication system in accord with claim 1 where the energized called party loop circuit includes third relay means operating under the control of the second hook switch and dialing means, where said control unit includes (a) said third relay means, and (b) third switching means actuated and controlled by said third relay means, where manipulation of said dialing means to generate the predetermined signal produces a predetermined number of circuit breaking pulses in said called party loop circuit, where said third relay means is responsive to said pulses and actuates said third switching means in response to each of said pulses, where the auxiliary unit associated with said selected control unit includes an open circuit which comprises fourth relay means that is operated by completion of the open circuit, where said second switching means is connected in said control unit to the calling party sleeve circuit and actuatable by said fourth relay means to complete said electrically conductive path in said calling party sleeve circuit and in parallel with the first switching means therein, and where said signal detecting means includes (a) a pulse sensing circuit that comprises said third switching means, and (b) fourth switching means responsive to said sensing circuit and actUatable to complete said open circuit upon the actuation of said third switching means in response to said predetermined number of pulses.
Claim 4
Dependent Claim
73 words
A telephone communication system in accord with claim 2 where the auxiliary unit associated with said selected control unit includes fifth switching means operated by the fourth relay means, a relay locking circuit energized by operation of the fifth switching means for maintaining the fourth relay means operatively energized, and where the relay locking circuit includes the fourth relay means and normally closed sixth switching means manipulatable to break the relay locking circuit.
Claim 5
Dependent Claim
227 words
A telephone communication system in accord with claim 1 where the energized called party loop circuit includes third relay means operating under the control of the second hook switch and dialing means, where said control unit includes (a) said third relay means, and (b) third switching means actuated and controlled by said third relay means, where manipulation of the dialing means to generate the predetermined signal produces a predetermined number of circuit breaking pulses in said called party loop circuit, where said third relay means is responsive to said pulses and actuates said third switching means in response to each of said pulses, where the auxiliary unit associated with said selected control unit includes an open circuit which comprises fourth relay means that is operated by completion of the open circuit, where said second switching means is connected in the control unit to the called party sleeve circuit and actuatable by said fourth relay means to complete said electrically conductive path in the called party sleeve circuit and in parallel with the first switching means therein, and where said signal detecting means includes (a) a pulse sensing circuit that comprises said third switching means, and (b) fourth switching means responsive to said sensing circuit and actuatable to complete said open circuit upon the actuation of said third switching means in response to said predetermined number of pulses.
Claim 6
Dependent Claim
72 words
A telephone communication system in accord with claim 4 where the auxiliary unit associated with said selected control unit includes fifth switching means operated by the fourth relay means, a relay locking circuit energized by operation of the fifth switching means for maintaining the fourth relay means operatively energized, where the relay locking circuit includes said fourth relay means and normally closed sixth switching means manipulatable to break the relay locking circuit.
Claim 7
Dependent Claim
309 words
A telephone communication system in accord with claim 1 where the energized called party loop circuit includes third relay means operating under the control of the second hook switch and the dialing means, where said control unit includes (a) said third relay means, and (b) third switching means actuated and controlled by said third relay means, where manipulation of said dialing means to generate the predetermined signal produces a predetermined number of circuit breaking pulses in said called party loop circuit, where said third relay means is responsive to said pulses and actuates said third switching means in response to each of said pulses, where the auxiliary unit associated with said selected control unit includes an open circuit which comprises fourth relay means that is operated by completion of the open circuit, where said second switching means is connected in the control unit to both of the calling and called party sleeve circuits and to both of the calling and called party loop circuits and is actuatable by the fourth relay means to complete (a) said electrically conductive path in the calling party sleeve circuit and in parallel with the first switching means therein, (b) another electrically conductive path in the called party sleeve circuit which is in parallel with the first switching means therein, (c) another electrically conductive path in the calling party loop circuit which is in parallel with the first hook switch theRein, and (d) another electrically conductive path in the called party loop circuit which is in parallel with the second hook switch therein, and where said signal detecting means includes (a) a pulse sensing circuit that comprises said third switching means, and (b) fourth switching means responsive to said sensing circuit and actuatable to complete said open circuit upon the actuation of said third switching means in response to said predetermined number of pulses.
Claim 8
Dependent Claim
72 words
A telephone communication system in accord with claim 6 where the auxiliary unit associated with said selected control unit includes fifth switching means operated by the fourth relay means, a relay locking circuit energized by operation of the fifth switching means for maintaining the fourth relay means operatively energized, where the relay locking circuit includes said fourth relay means and normally closed sixth switching means manipulatable to break the relay locking circuit.
Claim 9
Dependent Claim
171 words
A telephone communication system in accord with claim 1 where manipulation of said dialing means to generate the predetermined signal produces a predetermined tone signal in the talking circuit, where the auxiliary unit associated with said selected control unit includes a first circuit which comprises third relay means that is operated by completion of said first circuit, where said second switching means is connected in the control unit to both of the calling and called party sleeve circuits and is actuatable by the third relay means to complete (a) said electrically conductive path in the calling party sleeve circuit and in parallel with the first switching means therein, and (b) another electrically conductive path in the called party sleeve circuit which is in parallel with the first switching means therein, and where said signal detecting means includes fourth relay means coupled to the talking circuit in said control unit for controlling the completion of said first circuit in response to the production of said predetermined tone signal in said talking circuit.
Claim 10
Dependent Claim
85 words
A telephone communicaton system in accord with claim 8 where said second switching means is also connected in the control unit to both of the calling and called party loop circuits and is actuatable by the third relay means to also complete (a) an electrically conductive path in the calling party loop circuit which is in parallel with the first hook switch therein, and (b) an electrically conductive path in the called party loop circuit which is in parallel with the second hook switch therein.
Claim 11
Dependent Claim
72 words
A telephone communication system in accord with claim 9 where the auxiliary unit associated with the selected control unit includes third switching means operated by the third relay means, a relay locking circuit energized by operation of the third switching means for maintaining the third relay means operatively energized, where the relay locking circuit includes said third relay means and normally closed fourth switching means manipulatable to break the relay locking circuit.
Claim 12
Dependent Claim
35 words
A telephone communication system in accord with claim 8 where the system further comprises a monitoring system having a communication circuit that is coupled to the talking circuit by actuation of said third relay means.
Claim 13
Dependent Claim
17 words
A telephone communication system in accord with claim 11 where the communication circuit includes voice recording means.
Claim 14
Dependent Claim
18 words
A telephone communication system in accord with claim 11 where the communication circuit includes another called party telephone.
Claim 15
Dependent Claim
72 words
A telephone communication system in accord with claim 8 where the auxiliary unit associated with said selected control unit includes third switching means operated by the third relay means, a relay locking circuit energized by operation of the third switching means for maintaining the third relay means operatively energized, where the relay locking circuit includes said third relay means and normally closed fourth switching means manipulatable to break the relay locking circuit.
Claim 16
Dependent Claim
250 words
A telephone communication system in accord with claim 1 where the energized called party loop circuit includes third relay means operating under the control of the second hook switch and the dialing means, where said control unit includes (a) said third relay means, and (b) third switching means actuated and controlled by said third relay means, where manipulation of said dialing means to generate the predetermined signal produces a predetermined number of circuit breaking pulses in said called party loop circuit, where said third relay means is responsive to said pulses and actuates said third switching means in response to each of said pulses, where said auxiliary unit includes an open circuit which comprises fourth relay means that is operated by completion of the open circuit, where said second switching means is connected in the control unit to both of the calling and called party sleeve circuits and is actuatable by the fourth relay means to complete (a) said electrically conductive path in the calling party sleeve circuit and in parallel with the first switching means therein, and (b) another electrically conductive path in the called party sleeve circuit which is in parallel with the first switching means therein, and where said signal detecting means includes (a) a pulse sensing circuit that comprises said third switching means, and (b) fourth switching means responsive to said sensing circuit and actuatable to complete said open circuit upon the actuation of said third switching means in response to said predetermined number of pulses.
Claim 17
Dependent Claim
72 words
A telephone communication system in accord with claim 15 where the auxiliary unit associated with the selected control unit includes fifth switching means operated by the fourth relay means, a relay locking circuit energized by operation of the fifth switching means for maintaining the fourth relay means operatively energized, where the relay locking circuit includes said fourth relay means and normally closed sixth switching means manipulatable to break the relay locking circuit.
Claim 18
Dependent Claim
405 words
A telephone communication system comprising (a) a calling party telephone having a first hook switch, (b) a called party telephone having a second hook switch and dialing means, and (c) central office exchange equipment completing a talking circuit between the calling and called party telephones and establishing energized circuits that comprises (1) a calling party loop circuit which includes said first hook switch and first relay means operating under the control of said first hook switch, (2) a called party loop circuit which includes said second hook switch and said dialing means, (3) a called party sleeve circuit operating to maintain the calling party loop circuit, and (4) a called party sleeve circuit operating to maintain the called party loop circuit; said exchange equipment comprising (a) selectable circuit completing control units for controlling the maintenance of respective talking circuits completed between calling and called party telephones, and (b) automatic selector means for selecting one of said units, said control units including a selected control unit completing and operating in dependency upon the closed conditions of the first hook switch and the second hook switch to maintain said energized circuits, said control unit comprising (a) said first relay means, (b) second relay means operating under the control of the first relay means to maintain the calling and called party sleeve circuits, and (c) capacitance means coupling the calling and called party loop circuits and therewith completing said talking circuit, and said dialing means being manipulatable by the called party to generate in the called party loop circuit signals that are associated with the respective digits in telephone numbers, said system further comprising an auxiliary unit associated with each of said control units and which is actuatable by the called party for controlling the maintenance of the energized calling and callEd party sleeve circuits completed through the control unit associated therewith, the auxiliary unit associated with said selected control unit including (a) first switching means connected in the control unit to the energized calling party loop circuit and actuatable to complete an electrically conductive path in said calling party loop circuit that is in parallel with the first hook switch included therein, and (b) signal detecting means connected in the control unit to detect said signals in the called party loop circuit, and said detecting means being responsive to the detection of a predetermined one of said signals to control the actuation of said first switching means.
Claim 19
Dependent Claim
405 words
A telephone communication system comprising (a) a calling party telephone having a first hook switch, (b) a called party telephone having a second hook switch and dialing means, and (c) central office exchange equipment completing a talking circuit between the calling and called party telephones and establishing energized circuits that comprises (1) a calling party loop circuit which includes said first hook switch and first relay means operating under the control of said first hook switch, (2) a called party loop circuit which includes said second hook switch and said dialing means, (3) a called party sleeve circuit operating to maintain the calling party loop circuit, and (4) a called party sleeve circuit operating to maintain the called party loop circuit; said exchange equipment comprising (a) selectable circuit completing control units for controlling the maintenance of respective talking circuits completed between calling and called party telephones, and (b) automatic selector means for selecting one of said units, said control units including a selected control unit completing and operating in dependency upon the closed conditions of the first hook switch and the second hook switch to maintain said energized circuits, said control unit comprising (a) said first relay means, (b) second relay means operating under the control of the first relay means to maintain the calling and called party sleeve circuits, and (c) capacitance means coupling the calling and called party loop circuits and therewith completing said talking circuit, and said dialing means being manipulatable by the called party to generate in the called party loop circuit signals that are associated with the respective digits in telephone numbers, said system further comprising an auxiliary unit associated with each of said control units and which is actuatable by the called party for controlling the maintenance of the energized calling and callEd party sleeve circuits completed through the control unit associated therewith, the auxiliary unit associated with said selected control unit including (a) first switching means connected in the control unit to the energized calling party loop circuit and actuatable to complete an electrically conductive path in said calling party loop circuit that is in parallel with the first hook switch included therein, and (b) signal detecting means connected in the control unit to detect said signals in the called party loop circuit, and said detecting means being responsive to the detection of a predetermined one of said signals to control the actuation of said first switching means.
Claim 20
Dependent Claim
206 words
A telephone communication system in accord with claim 12 where the energized called party loop circuit includes third relay means operating under the control of the second hook switch and dialing means, where said control unit includes (a) said third relay means, and (b) second switching means actuated and controlled by said third relay means, where manipulation of said dialing means to generate the predetermined signal produces a predetermined number of circuit breaking pulses in said called party loop circuit, where said third relay means is responsive to said pulses and actuates said second switching means in response to each of said pulses, where the auxiliary unit associated with the selected control unit includes an open circuit which comprises fourth relay means that is operated by completion of the open circuit, where said first switching means is actuatable by said fourth relay means to complete said electrically conductive path in the calling party loop circuit, and where said signal detecting means includes (a) a pulse sensing circuit that comprises said second switching means, and (b) third switching means responsive to said sensing circuit and actuatable to complete said open circuit upon the actuation of said second switching means in response to said predetermined number of pulses.
Claim 21
Dependent Claim
72 words
A telephone communication system in accord with claim 18 where the auxiliary unit associated with said selected control unit includes fourth switching means operated by the fourth relay means, a relay locking circuit energized by operation of the fourth switching means for maintaining the fourth relay means operatively energized, where the relay locking circuit includes said fourth relay means and normally closed fifth switching means manipulatable to break the relay locking circuit.
Claim 22
Dependent Claim
247 words
A telephone communication system in accord with claim 17 where the energized called party loop circuit includes third relay means operating under the control of the second hook switch and the dialing means, where said control unit includes (a) said third relay means, and (b) second switching means actuated and controlled by said third relay means, where manipulation of said dialing means to generate the predetermined signal produces a predetermined number of circuit breaking pulses in said called party loop circuit, where said third relay means is responsive to said pulses and actuates said second switching means in response to each of said pulses, where the auxiliary unit associated with the selected control unit includes an open circuit which comprises fourth relay means that is operated by completion of the open circuit, where said first switching means is connected in the control unit to both of the calling and called party loop circuits and is actuatable by said fourth relay means to complete (a) said electrically conductive path in the calling party loop circuit, and (b) another electrically conductive path in the called party loop circuit which is in parallel with the second hook switch therein, and where said signal detecting means includes a pulse sensing circuit that comprises (a) said second switching means, and (b) third switching means responsive to said sensing circuit and actuatable to complete said open circuit upon the actuation of said second switching means in response to said predetermined nUmber of pulses.
Claim 23
Dependent Claim
35 words
A telephone communication system in accord with claim 20 where the system further comprises a monitoring system having a communication circuit that is coupled to the talking circuit by actuation of said fourth relay means.
Claim 24
Dependent Claim
17 words
A telephone communication system in accord with claim 21 where the communication circuit includes voice recording means.
Claim 25
Dependent Claim
18 words
A telephone communication system in accord with claim 21 where the communication circuit includes another called party telephone.
Claim 26
Dependent Claim
72 words
A telephone communication system in accord with claim 20 where the auxiliary unit associated with the selected control unit includes fourth switching means operated by the fourth relay means, a relay locking circuit energized by operation of the fourth switching means for maintaining the fourth relay means operatively energized, where the relay locking circuit includes said fourth relay means and normally closed fifth switching means manipulatable to break the relay locking circuit.
Claim 27
Dependent Claim
162 words
A telephone communication system in accord with claim 17 where manipulation of said dialing means to generate the predetermined signal produces a predetermined tone signal in the talking circuit, where the auxiliary unit associated with the selected control unit includes a first circuit which comprises third relay means that is operated by completion of said first circuit, where said first switching means is connected in the control unit to both of the calling and called party loop circuits and is actuatable by the third relay means to complete (a) said electrically conductive path in the calling party loop circuit, and (b) another electrically conductive path in the called party loop circuit which is in parallel with the second hook switch therein, and where said signal detecting means includes fourth relay means coupled to the talking circuit in said control unit for controlling the completion of said first circuit in response to the production of said predetermined tone signal in said talking circuit.
Claim 28
Dependent Claim
72 words
A telephone communication system in accord with claim 25 where the auxiliary unit associated with said selected control unit includes second switching means operated by the third relay means, a relay locking circuit energized by operation of the second switching means for maintaining the third relay means operatively energized, where the relay locking circuit includes said third relay means and normally closed third switching means manipulatable to break the relay locking circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |