Patent US3700926A successfully refreshed from Google Patents.
US3700926A
Expired / Lapsed
US
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Electronic bilateral beta element switch
Assignee: AT&T Inc
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Filing: 1971-05-28
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Granted: 1972-10-24
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Expires: 1991-05-28
Abstract
Abstract An electronic reversing switch or beta element is disclosed which functions to interconnect terminals on both half cycles of a carrier signal. Connections are switched between the terminals in response to a change in a control signal. The terminals are connected via selectively enabled bridge circuits containing parallel branches that may be energized on alternate half cycles of the carrier. Each branch includes a serially connected pair of oppositely poled semiconductor devices that exhibit a high impedance between the terminals when off and a low impedance when on for any polarity of external signals. A two-telephone intercom arrangement employing the electronic switches is also disclosed.
Inventors
- 👤 James Edwin Dalley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:32
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/62; H03K17/6221; H03K17/6285; H03K17/68; H04; H04M; H04M9/00; H04M9/001; H04Q; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/521
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
188 words
An electronic reversing switch for connecting each of a first and second input terminal exclusively to either the first or second of two output terminals comprising, four electronic bridge circuits, each of said bridge circuits having parallel branches wherein each branch includes a pair of serially connected transistor elements, at least one corresponding electrode of each of said transistor elements being connected together, a first and a second source of pulses, said first source being connected to the first and second of said bridge circuits and said second source being connected to the third and fourth of said bridge circuits, said first bridge circuit being connected between said first input and said first output terminal, said third bridge circuit being connected between said first input and said second output terminal, said second bridge circuit being connected betWeen said second input and said second output terminal and said fourth bridge circuit being connected between said second input and said first output terminal, and control circuit means for rendering either said first or said second source of pulses operative to apply pulses to its respective ones of said bridge circuits.
Claim 2
Dependent Claim
188 words
An electronic reversing switch for connecting each of a first and second input terminal exclusively to either the first or second of two output terminals comprising, four electronic bridge circuits, each of said bridge circuits having parallel branches wherein each branch includes a pair of serially connected transistor elements, at least one corresponding electrode of each of said transistor elements being connected together, a first and a second source of pulses, said first source being connected to the first and second of said bridge circuits and said second source being connected to the third and fourth of said bridge circuits, said first bridge circuit being connected between said first input and said first output terminal, said third bridge circuit being connected between said first input and said second output terminal, said second bridge circuit being connected betWeen said second input and said second output terminal and said fourth bridge circuit being connected between said second input and said first output terminal, and control circuit means for rendering either said first or said second source of pulses operative to apply pulses to its respective ones of said bridge circuits.
Claim 3
Dependent Claim
162 words
An electronic switch comprising a pair of input and output terminals, a plurality of electronic bridge circuits connecting each of said input terminals with each of said output terminals, each of said bridge circuits including a first and a second pair of oppositely poled, serially connected semiconductor devices, the oppositely poled devices of said first pair being connected in parallel with said devices of said second pair, and a plurality of pulse sources including a respective transformer coupled to pairs of said bridge circuits and controllable to apply enabling pulses to either the pair of said bridge circuits connecting a first of said input terminals with a first of said output terminals and the second of said input terminals with the second of said output terminals or to the pair of said bridge circuits connecting the first of said input terminals to the second of said output terminals and the second of said input terminals with the first of said output terminals.
Claim 4
Dependent Claim
162 words
An electronic switch comprising a pair of input and output terminals, a plurality of electronic bridge circuits connecting each of said input terminals with each of said output terminals, each of said bridge circuits including a first and a second pair of oppositely poled, serially connected semiconductor devices, the oppositely poled devices of said first pair being connected in parallel with said devices of said second pair, and a plurality of pulse sources including a respective transformer coupled to pairs of said bridge circuits and controllable to apply enabling pulses to either the pair of said bridge circuits connecting a first of said input terminals with a first of said output terminals and the second of said input terminals with the second of said output terminals or to the pair of said bridge circuits connecting the first of said input terminals to the second of said output terminals and the second of said input terminals with the first of said output terminals.
Claim 5
Dependent Claim
178 words
An electronic reversing switch circuit comprising a first and a second pair of oppositely poled, serially connected semiconductor devices and means for applying one polarity of pulse signals to a common junction of one of said serially connected pair of semiconductor devices and the oppositely poled signal to the corresponding junction of the other of said pair of serially connected semiconductor devices, said signal applying means including a bipolar pulse source having a pulse transformer connected to said common junction and said corresponding junction of said semiconductor devices, a source of carrier signals, a source of control signals, and gating means connected to said source of control signals for selectively applying said source of carrier signals to said pulse transformer, aid gating means having a pair of NOR gates each having an input terminal connected to said source of control signals, one of said NOR gates having its other input terminal connected directly to said source of carrier signals and the other of said NoR gates having its other input terminal connected to receive said carrier signals inverted.
Claim 6
Dependent Claim
178 words
An electronic reversing switch circuit comprising a first and a second pair of oppositely poled, serially connected semiconductor devices and means for applying one polarity of pulse signals to a common junction of one of said serially connected pair of semiconductor devices and the oppositely poled signal to the corresponding junction of the other of said pair of serially connected semiconductor devices, said signal applying means including a bipolar pulse source having a pulse transformer connected to said common junction and said corresponding junction of said semiconductor devices, a source of carrier signals, a source of control signals, and gating means connected to said source of control signals for selectively applying said source of carrier signals to said pulse transformer, aid gating means having a pair of NOR gates each having an input terminal connected to said source of control signals, one of said NOR gates having its other input terminal connected directly to said source of carrier signals and the other of said NoR gates having its other input terminal connected to receive said carrier signals inverted.
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |