Patent US3311842A successfully refreshed from Google Patents.
US3767942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state relay
Assignee: MULTIPLEX COMMUNICAT Inc
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Filing: 1971-03-10
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Granted: 1973-10-23
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Expires: 1991-03-10
Abstract
Abstract A solid state relay structure includes electrically isolated control and plural output switch ports. The arrangement can provide any desired switch configuration, wherein the individual switching elements may be adjusted to operate in any preferred sequence. The relay employs a keyed oscillator, acting through detector circuitry inductively coupled thereto, to selectively pinch off conduction in a depletion mode field effect transistor which normally maintains an output switching transistor conductive (a ''''normally closed'''' relay output). Correspondingly, an independently detected oscillation-responsive output signal initiates conduction in an additional transistor switch included in a normally nonconductive (''''normally open'''') switching channel. In accordance with one aspect of the invention, diode bridge arrays selectively render the input and output ports insensitive to the polarity of the relay energization or the output load current.
Inventors
- 👤 N Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:26
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/601; H03K17/74; H03K17/76
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
In combination in a solid state relay, means for selectively supplying an alternating potential, detector means inductively coupled to said potential supplying means, transistor switch means, a depletion mode field effect transistor having a gate terminal and source and drain terminals having a conduction channel therebetween, said source and drain conduction channel being connected to said transistor switch means, and said field effect transistor gate terminal being connected to said detector means, said detector means thereby controlling the conduction state of said field effect transistor and thereby also said transistor switch means depending upon the presence or absence of an alternating potential from said alternating potential source.
Claim 2
Dependent Claim
107 words
In combination in a solid state relay, means for selectively supplying an alternating potential, detector means inductively coupled to said potential supplying means, transistor switch means, a depletion mode field effect transistor having a gate terminal and source and drain terminals having a conduction channel therebetween, said source and drain conduction channel being connected to said transistor switch means, and said field effect transistor gate terminal being connected to said detector means, said detector means thereby controlling the conduction state of said field effect transistor and thereby also said transistor switch means depending upon the presence or absence of an alternating potential from said alternating potential source.
Claim 3
Dependent Claim
22 words
A combination as in claim 1, wherein said selective alternating potential supplying means comprises a keyed oscillator including an input control port.
Claim 4
Dependent Claim
19 words
A combination as in claim 2, further comprising a full wave bridge connected to said oscillator input control port.
Claim 5
Dependent Claim
29 words
A combination as in claim 3 , further comprising additional full wave bridge means connected to said transistor switch means and to said field effect transistor source-drain conduction channel.
Claim 6
Dependent Claim
30 words
A combination as in claim 1, wherein said detector means includes voltage divider means for varying the switching response time of said field effect transistor and said transistor switch means.
Claim 7
Dependent Claim
38 words
A combination as in claim 2, wherein said transistor switch means comprises normally closed switch means, and further comprising normally open switch means including additional transistor switch means, and additional detector means inductively coupled to said keyed oscillator.
Claim 8
Dependent Claim
34 words
A combination as in claim 6, wherein at least one of said detector means includes voltage divider means for varying the relative switching responses of said normally closed and said normally open switch means.
Claim 9
Dependent Claim
24 words
A combination as in claim 7, further comprising means interconnecting said normally open and said normally closed switch means for forming transfer switch means.
References Cited (Backward Citations)
US3041475A
Cited
US3023321A
Cited
US3210570A
Cited
US3488520A
Cited
US3473054A
Cited
US3492505A
Cited
US3495097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |