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Patent US3593035A successfully refreshed from Google Patents.
US3593035A
Expired / Lapsed
US
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Marginal switching arrangement
Assignee: International Standard Electric Corp
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Filing: 1968-11-18
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Granted: 1971-07-13
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Expires: 1988-11-18
Abstract
Abstract The arrangement provides two long-tail transistor pairs with paralleled collector outputs and a detecting device branched across the above pair of outputs. The input signal is compared with the upper and lower levels of the selected range by means of the first and a second transistor pair and gives rise to equal potentials at both ends of the detecting device except when this input signal is above or below the range.
Inventors
- 👤 Jean Victor Martens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:03
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; A; A62; A62C; A62C13/00; A62C13/66; G; G01; G01R; G01R19/00; G01R19/145; G01R19/165; H03; H03K; H03K5/00; H03K5/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
158 words
A marginal switching circuit comprising: a first transistor; a second transistor, the emitter of which is coupled to the emitter of said first transistor; a third transistor, the collector of which is coupled to the collector of said first transistor; a fourth transistor, the emitter of which is coupled to the emitter of said third transistor and the collector of which is coupled to the collector of said second transistor; means for providing a first reference voltage level to the base of said second transistor; means for providing a second reference voltage level, different than said first reference voltage level to the base of said fourth transistor; means for applying a third variable voltage level to the base of said first and third transistors; and means coupled between the collectors of said first and second transistors for responding when the level of said third voltage lies outside the range bounded by said first and second reference voltage levels.
Claim 2
Dependent Claim
158 words
A marginal switching circuit comprising: a first transistor; a second transistor, the emitter of which is coupled to the emitter of said first transistor; a third transistor, the collector of which is coupled to the collector of said first transistor; a fourth transistor, the emitter of which is coupled to the emitter of said third transistor and the collector of which is coupled to the collector of said second transistor; means for providing a first reference voltage level to the base of said second transistor; means for providing a second reference voltage level, different than said first reference voltage level to the base of said fourth transistor; means for applying a third variable voltage level to the base of said first and third transistors; and means coupled between the collectors of said first and second transistors for responding when the level of said third voltage lies outside the range bounded by said first and second reference voltage levels.
Claim 3
Dependent Claim
17 words
A marginal switching circuit, according to claim 1, wherein said responsive means is a current energized relay.
Claim 4
Dependent Claim
52 words
A marginal switching circuit, according to claim 2, wherein said first and third transistors conduct and said second and fourth transistors are cut off when the level of said third variable voltage exceeds the range bounded by said first and second reference voltage levels thereby providing a current flow through said relay.
Claim 5
Dependent Claim
53 words
A marginal switching circuit, according to claim 2, wherein said second and fourth transistors conduct and said first and third transistors are cut off when the level of said third variable voltage is below the range bounded by said first and second reference voltage levels, thereby providing a current flow through said relay.
Claim 6
Dependent Claim
95 words
A marginal switching circuit, according to claim 1, wherein said responsive means compriSes: a fifth transistor, the base of which is coupled to the collector of said first transistor; a sixth transistor, the base of which is coupled to the collector of the second transistor, the emitters of said fifth and sixth transistors being coupled one to the other, and the collectors of said fifth and sixth transistors being coupled one to the other; and means for providing a fourth reference voltage level to the junction of the emitters of said fifth and sixth transistors.
Claim 7
Dependent Claim
57 words
A marginal switching circuit, according to claim 5, wherein said first and third transistors conduct and said second and fourth transistors are cut off when the level of said third voltage exceeds the range bounded by said first and second reference voltage levels, thereby providing that said fifth transistor conducts and said sixth transistor is cut off.
Claim 8
Dependent Claim
58 words
A marginal switching circuit, according to claim 5, wherein said second and fourth transistors conduct and said first and third transistors are cut off when the level of said third voltage is below the range bounded by said first and second reference voltage levels, thereby providing that said sixth transistor conduct and said fifth transistor is cut off.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |