US3773973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Universal data-communications interface
Assignee: Bull HN Information Systems Italia SpA
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Filing: 1971-08-03
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Granted: 1973-11-20
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Expires: 1991-08-03
Abstract
Abstract A universal interface can be connected between a datacommunications subchannel and either a modem or a teletypewriter. A switch in the interface causes the interface to provide signals which can be used by the modem when the switch is in a first position and causes the interface to provide signals which can be used directly by a teletypewriter when the switch is in a second position.
Inventors
- 👤 J Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:09
CPC Classifications
H; H04; H04L; H04L5/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
255 words
A universal data-communications interface for connecting a processor subchannel to a data device having first and second input terminals where the data device can be either one of the following: a teletypewriter and a modem, said subchannel having an input terminal and an output terminal, said interface including: first and second inverters each having an input lead and an output lead; a bipolar transmitter having an input lead and an output lead, said first inverter being connected between said output terminal of said subchannel and said input lead of said transmitter, said output lead of said transmitter being connected to said first input terminal of said device; a bipolar receiver having an input lead and an output lead, said input lead of said receiver being connected to said second input terminal of said device; an electronic switch having an input lead, a control lead and an output lead, said control lead of said electronic switch being connected to said output terminal of said subchannel, said input lead of said electronic switch being connected to said output lead of said receiver, said output lead of said electronic switch being connected to said input lead of said second inverter, said output lead of said second inverter being connected to said input terminal of said subchannel; a switch having first and second terminals; a resistor; and a reference potential, said resistor being connected between said potential and said first terminal of said switch, said second terminal of said switch being connected to said input lead of said receiver.
Claim 2
Dependent Claim
255 words
A universal data-communications interface for connecting a processor subchannel to a data device having first and second input terminals where the data device can be either one of the following: a teletypewriter and a modem, said subchannel having an input terminal and an output terminal, said interface including: first and second inverters each having an input lead and an output lead; a bipolar transmitter having an input lead and an output lead, said first inverter being connected between said output terminal of said subchannel and said input lead of said transmitter, said output lead of said transmitter being connected to said first input terminal of said device; a bipolar receiver having an input lead and an output lead, said input lead of said receiver being connected to said second input terminal of said device; an electronic switch having an input lead, a control lead and an output lead, said control lead of said electronic switch being connected to said output terminal of said subchannel, said input lead of said electronic switch being connected to said output lead of said receiver, said output lead of said electronic switch being connected to said input lead of said second inverter, said output lead of said second inverter being connected to said input terminal of said subchannel; a switch having first and second terminals; a resistor; and a reference potential, said resistor being connected between said potential and said first terminal of said switch, said second terminal of said switch being connected to said input lead of said receiver.
Claim 3
Dependent Claim
74 words
A universal data-communications interface as defined in claim 1 wherein said electronic switch includes: an AND-gate having first and second input leads and an output lead, said output lead of said gate being connected to said input lead of said second inverter, said first input lead of said gate being connected to said output lead of said receiver, said second input lead of said gate being connected to said output terminal of said subchanneL.
Claim 4
Dependent Claim
276 words
A universal data-communications interface for connecting a processor subchannel to a data device having first and second input terminals where the data device can be either one of the following: a teletypewriter and a modem, said subchannel having an input terminal and an output terminal, said interface comprising: first, second and third inverters; a bipolar transmitter having an input lead and an output lead, said first inverter being connected between said output terminal of said subchannel and said input lead of said transmitter, said output lead of said transmitter being connected to said first input terminal of said device; first and second AND-gates each having first and second input leads and an output lead; a bipolar receiver having an input lead and an output lead, said input lead of said receiver being connected to said second input terminal of said device, said second inverter being connected between said input lead of said subchannel and said output lead of said first gate, said output lead of said receiver being connected to said first input lead of said first gate, said third inverter being connected between said output lead of said second gate and said second input lead of said first gate, said first input lead of said second gate being connected to said input lead of said transmitter, said second input lead of said second gate being connected to said input terminal of said subchannel; a switch having first and second terminals; a resistor; and a reference potential, said resistor being connected between said potential and said first terminal of said switch, said second terminal of said switch being connected to said input lead of said receiver.
Claim 5
Dependent Claim
276 words
A universal data-communications interface for connecting a processor subchannel to a data device having first and second input terminals where the data device can be either one of the following: a teletypewriter and a modem, said subchannel having an input terminal and an output terminal, said interface comprising: first, second and third inverters; a bipolar transmitter having an input lead and an output lead, said first inverter being connected between said output terminal of said subchannel and said input lead of said transmitter, said output lead of said transmitter being connected to said first input terminal of said device; first and second AND-gates each having first and second input leads and an output lead; a bipolar receiver having an input lead and an output lead, said input lead of said receiver being connected to said second input terminal of said device, said second inverter being connected between said input lead of said subchannel and said output lead of said first gate, said output lead of said receiver being connected to said first input lead of said first gate, said third inverter being connected between said output lead of said second gate and said second input lead of said first gate, said first input lead of said second gate being connected to said input lead of said transmitter, said second input lead of said second gate being connected to said input terminal of said subchannel; a switch having first and second terminals; a resistor; and a reference potential, said resistor being connected between said potential and said first terminal of said switch, said second terminal of said switch being connected to said input lead of said receiver.
Claim 6
Dependent Claim
232 words
A universal data-communications interface for connecting a processor subchannel to a data device having first and second input terminals where the data device can be either one of the following: a teletypewriter and a modem, said subchannel having an input terminal and an output terminal, said interface comprising: an inverter having an input lead and an output lead; a bipolar transmitter having an input lead and an output lead, said inverter being connected between said output terminal of said subchannel and said input lead of said transmitter, said output lead of said transmitter being connected to said first input terminal of said device; a bipolar receiver having an input lead and an output lead, said input lead of said receiver being connected to said second input terminal of said device; A D.C. flip-flop having first and second input leads and an output lead, said output lead of said flip-flop being connected to said input terminal of said subchannel, said first input lead of said flip-flop being connected to said input lead of said transmitter, said second input lead of said flip-flop being connected to said output lead of said receiver; a switch having first and second terminals; a resistor; and a reference potential, said resistor being connected between said potential and said first terminal of said switch, said second terminal of said switch being connected to said input lead of said receiver.
Claim 7
Dependent Claim
232 words
A universal data-communications interface for connecting a processor subchannel to a data device having first and second input terminals where the data device can be either one of the following: a teletypewriter and a modem, said subchannel having an input terminal and an output terminal, said interface comprising: an inverter having an input lead and an output lead; a bipolar transmitter having an input lead and an output lead, said inverter being connected between said output terminal of said subchannel and said input lead of said transmitter, said output lead of said transmitter being connected to said first input terminal of said device; a bipolar receiver having an input lead and an output lead, said input lead of said receiver being connected to said second input terminal of said device; A D.C. flip-flop having first and second input leads and an output lead, said output lead of said flip-flop being connected to said input terminal of said subchannel, said first input lead of said flip-flop being connected to said input lead of said transmitter, said second input lead of said flip-flop being connected to said output lead of said receiver; a switch having first and second terminals; a resistor; and a reference potential, said resistor being connected between said potential and said first terminal of said switch, said second terminal of said switch being connected to said input lead of said receiver.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |