US3863025A — Data transmission method

Claim 1

Independent Claim 255 words

A data communication method including the transmitting of data signals of firSt and second values and simultaneously transmitting synchronizing pulses of at least two different phases, and the receiving of said transmission, comprising the steps of: combining a pair of synchronizing pulses of first and second phases with each data signal of said first value; generating a pair of consecutive output pulses, the first pulse of a first polarity and the second pulse of a second polarity, in response to each combination of a pair of synchronizing signals with a data signal of said first value, each of said generated pairs of output pulses representative of a data signal of said first value, said first pulse representative of a synchronizing pulse of said first phase, and said second pulse representative of a synchronizing pulse of said second phase; combining a pair of synchronizing pulses of first and second phases with each data signal of said second value; generating a pair of consecutive output pulses the first of said second polarity and the second of said first polarity in response to each combination of a pair of synchronizing pulses with a data signal of said second value, each of said generated pairs of output pulses representative of a data signal of said second value, said first pulse representative of a synchronizing pulse of said first phase, and said second pulse representative of a synchronizing pulse of said second phase; coupling said generated output pulses to a transmission medium; receiving said output pulses from said transmission medium.

Claim 2

Dependent Claim 255 words

A data communication method including the transmitting of data signals of firSt and second values and simultaneously transmitting synchronizing pulses of at least two different phases, and the receiving of said transmission, comprising the steps of: combining a pair of synchronizing pulses of first and second phases with each data signal of said first value; generating a pair of consecutive output pulses, the first pulse of a first polarity and the second pulse of a second polarity, in response to each combination of a pair of synchronizing signals with a data signal of said first value, each of said generated pairs of output pulses representative of a data signal of said first value, said first pulse representative of a synchronizing pulse of said first phase, and said second pulse representative of a synchronizing pulse of said second phase; combining a pair of synchronizing pulses of first and second phases with each data signal of said second value; generating a pair of consecutive output pulses the first of said second polarity and the second of said first polarity in response to each combination of a pair of synchronizing pulses with a data signal of said second value, each of said generated pairs of output pulses representative of a data signal of said second value, said first pulse representative of a synchronizing pulse of said first phase, and said second pulse representative of a synchronizing pulse of said second phase; coupling said generated output pulses to a transmission medium; receiving said output pulses from said transmission medium.

Claim 3

Dependent Claim 91 words

The data communication method claimed in claim 1 wherein said receiving step further comprises the steps of: coupling said output pulse pairs from said transmission medium; generating in response to each received pulse pair wherein the first pulse is of said first polarity and the second pulse is of said second polarity, a data signal of said first value; generating in response to each received pulse pair wherein the first pulse is of said second polarity and the second pulses of said first polarity, a data signal of said second value.

Claim 4

Dependent Claim 60 words

A data communication method as claimed in claim 2 wherein there are included the additional steps of: generating in response to each received first pulse of each pair of said pulses, a synchronizing pulse of said first phase; and generating in response to each received second pulse of each pair of said pulses, a synchronizing pulse of said second phase.

Claim 5

Dependent Claim 210 words

A data communication system for transmitting of data signals of first and second values and synchronizing pulses of at least two different phases from a transmitter to a receiver over an intervening transmission medium, said transmitter comprising: means for generating cyclically recurring synchronizing pulses of at least two different phases; gating means connected to said generating means, and to a source of data signals of first and second values, and including a plurality of output circuit connections to said transission medium; said gating means operated in response to a data signal of a first value and a pair of synchronizing pulses of first and second phases, to generate at said output circuit connections a pair of output pulses, said first pulse of said pair, of a first polarity and said second pulse of said pair, of a second polarity; said gating means further operated in response to a data signal of a second value and a pair of synchronizing pulses of first and second phases, to generate at said output circuit connections a pair of output pulses, said first pulse of said pair, of said second polarity and said second pulse of said pair, of said first polarity; said output pulses conducted to said receiver over said intervening transmission medium.

Claim 6

Dependent Claim 210 words

A data communication system for transmitting of data signals of first and second values and synchronizing pulses of at least two different phases from a transmitter to a receiver over an intervening transmission medium, said transmitter comprising: means for generating cyclically recurring synchronizing pulses of at least two different phases; gating means connected to said generating means, and to a source of data signals of first and second values, and including a plurality of output circuit connections to said transission medium; said gating means operated in response to a data signal of a first value and a pair of synchronizing pulses of first and second phases, to generate at said output circuit connections a pair of output pulses, said first pulse of said pair, of a first polarity and said second pulse of said pair, of a second polarity; said gating means further operated in response to a data signal of a second value and a pair of synchronizing pulses of first and second phases, to generate at said output circuit connections a pair of output pulses, said first pulse of said pair, of said second polarity and said second pulse of said pair, of said first polarity; said output pulses conducted to said receiver over said intervening transmission medium.

Claim 7

Dependent Claim 31 words

A data communication system as claimed in claim 4 wherein: there is further included coupling means comprising a transformer connected between said gating means output circuit connections and said transmission medium.

Claim 8

Dependent Claim 156 words

A data communication system as claimed in claim 5 wherein: said gatiNg means comprise an OR gate having input circuit connections to said synchronizing pulse generating means, and an output circuit connection; an EXCLUSIVE-OR gate having a first input circuit connection to the second phase synchronizing pulse output of said generating means and a second input circuit connection to said source of data signals, and an output circuit connection; a first NAND gate including a first input circuit connection to the output of said OR gate and a second input circuit connection to the output of said EXCLUSIVE-OR gate, and an output circuit connection; a second NAND gate including a first input circuit connection to the output of said OR gate and a second input circuit connection to the output of said first NAND gate, and an output circuit connection; said output circuit connections from said first and second NAND gates connected to said coupling means.

Claim 9

Dependent Claim 136 words

A data communication system as claimed in claim 4 wherein said receiver comprises: gating means connected to said transmission medium, including a first output circuit connection; said gating means operated in response to receipt of a pair of output pulses from said transmitter conducted over said intervening transmission medium to generate at said first output circuit connection a data signal of said first value, in response to said pair of output pulses including a first pulse of said first polarity followed by a second pulse of said second polarity; and said gating means further operated to generate at said first output circuit connection a data signal of said second value in response to said pair of received output pulses including a first pulse of said second polarity followed by a second pulse of said first polarity.

Claim 10

Dependent Claim 83 words

A data communication system as claimed in claim 7 wherein said gating means further include second and third output circuit connections; said gating means further operated in response to the first pulse of each pair of received output pulses to generate a synchronizing pulse of said first phase at said second output circuit connection; and in response to each second pulse of each pair of received output pulses to generate a synchronizing pulse of said second phase at said third output circuit connection.

Claim 11

Dependent Claim 28 words

A data communication system as claimed in claim 7 wherein: there is further included coupling means comprising a transformer connected between said transmission medium and said gating means.

Claim 12

Dependent Claim 211 words

A data communication system as claimed in claim 8 wherein said gating means comprise the first NOR gate including a plurality of input circuit connections connected to said transmission medium and an output circuit connection; a pair of bistable switching circuits each including a first input circuit connection connected to said transmission medium and a second input circuit connection connected to the output of said first NOR gate, and each including first and second output circuit connections; an EXCLUSIVE-OR gate including a first circuit input connection connected to one of said first bistable switching circuit outputs and a second input circuit connection connected to one of said second bistable switching circuit outputs, the output of said EXCLUSIVE-OR gate connected to said second output circuit; a second NOR gate including a first circuit input connection connected to one of said first bistable switching circuit output circuits and a second input circuit connection connected to a second output of said second bistable switching circuit, and the output of said second NOR gate connected to said third output circuit; and a third bistable switching circuit including a first input connected to said transmission medium, a second input connected to the output of said EXCLUSIVE-OR gate and an output connected to said first output circuit.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-01-27	1978-07-29	1979-01-28	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-01-27	1982-07-29	1983-01-28	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-01-27	1986-07-29	1987-01-28	$7700.00	Window Closed / Lapsed

Data transmission method

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