Patent US3593178A successfully refreshed from Google Patents.
US3593178A
Expired / Lapsed
US
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Input switching circuit
Assignee: Honeywell Inc
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Filing: 1969-01-21
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Granted: 1971-07-13
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Expires: 1989-01-21
Abstract
Abstract A single signal current is selected from a plurality of DC signal currents of varied levels and is transmitted to means for performing measurement, operation and signal conversion.
Inventors
- 👤 Masayoshi Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:47
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/26; G06G7/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
181 words
A current signal switching circuit comprising, in combination: an amplifier having an input circuit, an output circuit, and a feedback circuit interconnecting said output circuit and said input circuit, a plurality of input signal current means, selectively controllable gate means connected between each of said input signal means and a point of fixed reference potential, said selectively controllable gate means comprising the sole impedance means between said plurality of input current signal current means, respectively, and said point of fixed reference potential, voltage responsive gating means connected between each of said input signal means and said input circuit of said amplifier, said voltage responsive gating means comprising the sole impedance means between said plurality of input signal current means, respectively, and said input circuit of said amplifier, said voltage responsive gating means being operative in response to the actuation of corresponding ones of said selectively controllable gate means, and means for selectively operating said controllable gate means whereby to selectively apply current signals from said input signal means to said input circuit of said amplifier through said voltage responsive gate means.
Claim 2
Dependent Claim
181 words
A current signal switching circuit comprising, in combination: an amplifier having an input circuit, an output circuit, and a feedback circuit interconnecting said output circuit and said input circuit, a plurality of input signal current means, selectively controllable gate means connected between each of said input signal means and a point of fixed reference potential, said selectively controllable gate means comprising the sole impedance means between said plurality of input current signal current means, respectively, and said point of fixed reference potential, voltage responsive gating means connected between each of said input signal means and said input circuit of said amplifier, said voltage responsive gating means comprising the sole impedance means between said plurality of input signal current means, respectively, and said input circuit of said amplifier, said voltage responsive gating means being operative in response to the actuation of corresponding ones of said selectively controllable gate means, and means for selectively operating said controllable gate means whereby to selectively apply current signals from said input signal means to said input circuit of said amplifier through said voltage responsive gate means.
Claim 3
Dependent Claim
16 words
The invention as set forth in claim 1 wherein said selectively controllable gate means comprise transistors.
Claim 4
Dependent Claim
49 words
The invention as set forth in claim 1 wherein said voltage responsive gate means comprise diodes which are effective to block the passage of signals to said input circuit whenever said controllable gate means are actuated to connect the associated signal means to said point of fixed reference potential.
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 |