US3757053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time multiplexed sampled data telephone system
Assignee: Delta Communications Corp
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Filing: 1971-09-10
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Granted: 1973-09-04
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Expires: 1991-09-10
Abstract
Abstract In a telephone system, audio signals to and from each telephone in the system are connected to a time division, amplitude modulated, multiplexed sampled data transmitting and receiving means by a pair of wires. Each telephone in the system may be used to receive paging or music signals, to make a call when it has been called, to intercept a conversation between two other telephones, to forward a call intended for it to another telephone, to complete a call directed to one of a group of telephones with any one telephone in the group which is not busy, and to provide a hands free operation at a called telephone. The various uses are selected by connecting a D.C. voltage, via each pair of wires, to each of the telephones, having the telephones draw currents according to desired modes of operation, and having the time multiplexed transmitter process audio signals according to the currents drawn.
Inventors
- 👤 R Pell
- 👤 S Churchill
- 👤 W Seeley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:53
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
117 words
A telephone communications system comprising: a plurality of telephones each of which originates and receives calls, and each of which includes a variable resistive load; a time division, amplitude modulated, multiplexed transmitting and receiving means for transmitting and receiving calls; electrical conductor means coupling each of said plurality of telephones to said time multiplexed transmitting and receiving means; means forming part of said transmitting and receiving means for supplying a D.C. voltage to each of said plurality of telephones via its respective conductor means; and means responsive to the current drawn by each of said plurality of telephones for routing calls for a first of said plurality of telephones to a second of said plurality of telephones.
Claim 2
Dependent Claim
117 words
A telephone communications system comprising: a plurality of telephones each of which originates and receives calls, and each of which includes a variable resistive load; a time division, amplitude modulated, multiplexed transmitting and receiving means for transmitting and receiving calls; electrical conductor means coupling each of said plurality of telephones to said time multiplexed transmitting and receiving means; means forming part of said transmitting and receiving means for supplying a D.C. voltage to each of said plurality of telephones via its respective conductor means; and means responsive to the current drawn by each of said plurality of telephones for routing calls for a first of said plurality of telephones to a second of said plurality of telephones.
Claim 3
Dependent Claim
45 words
A telephone communications system as defined in claim 1 wherein said time multiplexed transmitting and receiving means includes means for terminating an unanswered call from said first of said plurality of telephones to any other of said plurality of telephones after a predetermined time interval.
Claim 4
Dependent Claim
31 words
A telephone communications system as defined in claim 1, further including means for providing paging or music signals to said first of said plurality of telephones via its corresponding conductor means.
Claim 5
Dependent Claim
40 words
A telephone communications systems as defined in claim 1, further including a light source coupled to said conductor means, and wherein said time multiplexed transmitting and receiving means includes means coupled to said conductor means for lighting said light source.
Claim 6
Dependent Claim
52 words
A telephone communications system as defined in claim 1, further including an audio transceiver coupled to said conductor means, and wherein said time multiplexed transmitting and receiving means includes means responsive to the current drawn by a second of said plurality of telephones for controlling audio signal traffic at said audio transceiver.
Claim 7
Dependent Claim
55 words
A telephone communications system as defined in claim 1, wherein said plurality of telephones includes a group of telephones, and said time multiplexed transmitting and receiving means includes means for directing a call from said first of said plurality of telephones to any one of said group of telephones which is not receiving a call.
Claim 8
Dependent Claim
44 words
A telephone communications system as defined in claim 1, wherein said routing means includes means for routing a call from a first of said plurality of telephones, directed to a second of said plurality of telephones, to a third of said plurality of telephones.
Claim 9
Dependent Claim
45 words
A telephone communications system as defined in claim 7 wherein said time multiplexed transmitting and receiving means includes means for terminating an unanswered call from said first of said plurality of telephones to any other of said plurality of telephones after a predetermined time interval.
Claim 10
Dependent Claim
31 words
A telephone communications system as defined in claim 7, further including means for providing paging or music signals to said first of said plurality of telephones via its corresponding conductor means.
Claim 11
Dependent Claim
40 words
A telephone communications system as defined in claim 7, further including a light source coupled to said conductor means, and wherein said time multiplexed transmitting and receiving means includes means coupled to said conductor means for lighting said light source.
Claim 12
Dependent Claim
52 words
A telephone communications system as defined in claim 7, further including an audio transceiver coupled to said conductor means, and wherein said time multiplexed transmitting and receiving means includes means responsive to the current drawn by a second of said plurality of telephones for controlling audio signal traffic at said audio transceiver.
Claim 13
Dependent Claim
56 words
A telephone communications system as defined in claim 7, wherein said plurality of telephones includes a group of telephones, and wherein said time multiplexed transmitting and receiving means includes means for directing a call from said first of said plurality of telephones to any one of said group of telephones which is not receiving a call.
Claim 14
Dependent Claim
32 words
A telephone communications system as defined in claim 12, further including means for providing paging or music signals to said first of said plurality of telephones via its corresponding pair of wires.
Claim 15
Dependent Claim
45 words
A telephone communications system as defined in claim 12, wherein said time multiplexed transmitting and receiving means includes means for terminating an unanswered call from said first of said plurality of telephones to any other of said plurality of telephones, after a predetermined time interval.
Claim 16
Dependent Claim
177 words
A transceiver for a time-multiplexed sampled data telephone system, comprising: a first audio line; a second audio line; a telephone for transmitting and receiving electrical signals; a pair of wires coupled to said telephone; means for providing a first periodic pulse signal, in a variable time slot, coupled to said pair of wires; means for providing a second periodic pulse signal in a predetermined time slot; first pulse responsive means coupling said first audio line to said pair of wires; first and second demodulators coupled to said pair of wires; second pulse responsive means coupling said second audio line to said first demodulator; third pulse responsive means coupling said second audio line to said pair of wires; fourth pulse responsive means coupling said first audio line to said second demodulator; and means for selectively coupling said first periodic pulse signal to said third and fourth pulse responsive means or coupling said first periodic pulse signal to said first and second pulse responsive means and said second periodic pulse signal to said third and fourth pulse responsive means.
Claim 17
Dependent Claim
177 words
A transceiver for a time-multiplexed sampled data telephone system, comprising: a first audio line; a second audio line; a telephone for transmitting and receiving electrical signals; a pair of wires coupled to said telephone; means for providing a first periodic pulse signal, in a variable time slot, coupled to said pair of wires; means for providing a second periodic pulse signal in a predetermined time slot; first pulse responsive means coupling said first audio line to said pair of wires; first and second demodulators coupled to said pair of wires; second pulse responsive means coupling said second audio line to said first demodulator; third pulse responsive means coupling said second audio line to said pair of wires; fourth pulse responsive means coupling said first audio line to said second demodulator; and means for selectively coupling said first periodic pulse signal to said third and fourth pulse responsive means or coupling said first periodic pulse signal to said first and second pulse responsive means and said second periodic pulse signal to said third and fourth pulse responsive means.
Claim 18
Dependent Claim
24 words
A transceiver as defined in claim 15, including: a busy signal generator; and means coupling said busy signal generator to said pair of wires.
Claim 19
Dependent Claim
54 words
A transceiver as defined in claim 16, wherein said means coupling said busy signal generator to said pair of wires includes: a busy switch; a busy gate coupled to said busy switch; a power switch coupled to said busy gate and to said privacy switch; and a privacy line coupled to said privacy gate.
Claim 20
Dependent Claim
24 words
A transceiver as defined in claim 15, including: a ring tone generator; and means coupling said ring tone generator to said pair of wires.
Claim 21
Dependent Claim
71 words
A transceiver as defined in claim 18, wherein said means coupling said ring tone generator to said pair of wires includes: a ring control line; a ring receiver coupled to said ring control line and to said means for providing a second periodic pulse signal; a ring switch coupled to said ring tone generator and to said ring receiver; and a transformer coupling said ring switch to said pair of wires.
Claim 22
Dependent Claim
23 words
A transceiver as defined in claim 15 including: a bleep tone generator; and means coupling bleep tone generator to said pair of wires.
Claim 23
Dependent Claim
72 words
A transceiver as defined in claim 20, wherein said means coupling said bleep tone generator to said pair of wires includes: a power switch; a call intercept latch coupled to said power switch; a bleep network coupled to said call intercept latch and said bleep tone generator; a ring switch coupled to said bleep network and said power switch; and a transformer network coupling said ring switch to said pair of wires.
Claim 24
Dependent Claim
28 words
A transceiver as defined in claim 15 including: a paging and music signal generator; and means coupling said paging and music signal generator to said pair of wires.
Claim 25
Dependent Claim
48 words
A transceiver as defined in claim 22, wherein said means coupling said page-music generator to said pair of wires includes: a ring coupled to said page-music generator; a power switch coupled to said ring switch; and a transformer network coupling said ring switch to said pair of wires.
Claim 26
Dependent Claim
78 words
A transceiver as defined in claim 23, including: a busy signal generator; means coupling said busy signal generator to said pair of wires; a ring tone generator; means coupling said ring tone generator to said pair of wires; a bleep tone generator; ameans coupling said bleep tone generator to said pair of wires; a light pulse generator; a light bulb coupled to said pair of wires; and means coupling said light pulse generator to said pair of wires.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |