US3593177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 signal currents of varied levels, is amplified and is supplied to means for effecting measurement operation or signal conversion of the amplified signal current.
Inventors
- 👤 Masayoshi Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:14
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/26; G06G7/28
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
146 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 controlable gate means connected between each of said input signal means and said input circuit of said amplifier, said selectively controlable gate means comprising the sole impedance means between said plurality of input current means, respectively, and said input circuit of said amplifier; and voltage responsive gating means connected between each of said input signal current means and a point of fixed reference potential, said voltage responsive gating means comprising the sole impedance means between said input signal current means, respectively, and said point of fixed reference potential, said voltage responsive gating means being operative in response to the actuation of corresponding ones of said selectively controlable gate means.
Claim 2
Dependent Claim
146 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 controlable gate means connected between each of said input signal means and said input circuit of said amplifier, said selectively controlable gate means comprising the sole impedance means between said plurality of input current means, respectively, and said input circuit of said amplifier; and voltage responsive gating means connected between each of said input signal current means and a point of fixed reference potential, said voltage responsive gating means comprising the sole impedance means between said input signal current means, respectively, and said point of fixed reference potential, said voltage responsive gating means being operative in response to the actuation of corresponding ones of said selectively controlable gate means.
Claim 3
Dependent Claim
57 words
The invention as set forth in claim 1 wherein said voltage responsive gating means comprise diodes which are effective to block the passage of signals to said point of fixed reference potential whenever the associated one of said controllable gate means is actuated to unblock the passage of said signals to said input circuit of said amplifier.
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 |