Patent US3627092A successfully refreshed from Google Patents.
US4042885A
Expired / Lapsed
US
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Zeroing circuit
Assignee: Sunoco Inc
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Filing: 1975-10-30
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Granted: 1977-08-16
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Expires: 1995-10-30
Abstract
Abstract A zeroing circuit for use in conjunction with devices that produce output signals in response to input data signals feeds a compensating signal into such a device to produce a zero output signal when there is a zero input signal. The device being compensated is intermittently tested for the zero condition, and an aspect of the compensating signal is altered to produce the zero condition.
Inventors
- 👤 Charles F. Rhodes, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:24
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/86; G01N30/8651; G01R; G01R17/00; G01R17/02; G01N30/8603; G01N30/8613; G01N30/8624; G01N30/8641
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
94 words
An offset compensating circuit for automatically adjusting the input signal level of an electronic circuit having an input and an output to produce an output signal of a predetermined level in response to a predetermined input signal condition, said offset compensating circuit comprising: A. an amplifier having an input and an output, said input being coupled to receive the output signal from the electronic circuit; B. a first feedback loop, said first feedback loop being connected between said output of said amplifier and the input to the electronic circuit, said first feedback loop including:
Claim 2
Dependent Claim
94 words
An offset compensating circuit for automatically adjusting the input signal level of an electronic circuit having an input and an output to produce an output signal of a predetermined level in response to a predetermined input signal condition, said offset compensating circuit comprising: A. an amplifier having an input and an output, said input being coupled to receive the output signal from the electronic circuit; B. a first feedback loop, said first feedback loop being connected between said output of said amplifier and the input to the electronic circuit, said first feedback loop including:
Claim 3
Dependent Claim
128 words
a first capacitor having first and second plates; 2. first electronic switch means connected between said output of said amplifier and said first plate of said first capacitor; 3. means connecting said second plate of said first capacitor to a voltage reference; and 4. coupling means electrically disposed between said first plate of said first capacitor and the input to the electronic circuit; C. a second feedback loop, said second feedback loop being connected between said output and said input of said amplifier, said second feedback loop including: 1. a resistor; and 2. a second electronic switch disposed in series with said resistor; and D. means for intermittently generating switching signals to switch said first and second electronic switch means to be alternatively closed in a timed relationship.
Claim 4
Dependent Claim
128 words
a first capacitor having first and second plates; 2. first electronic switch means connected between said output of said amplifier and said first plate of said first capacitor; 3. means connecting said second plate of said first capacitor to a voltage reference; and 4. coupling means electrically disposed between said first plate of said first capacitor and the input to the electronic circuit; C. a second feedback loop, said second feedback loop being connected between said output and said input of said amplifier, said second feedback loop including: 1. a resistor; and 2. a second electronic switch disposed in series with said resistor; and D. means for intermittently generating switching signals to switch said first and second electronic switch means to be alternatively closed in a timed relationship.
Claim 5
Dependent Claim
34 words
The offset compensating circuit of claim 1 which further includes, in said first feedback loop, a buffer amplifier adapted to serve as a high impedance load to a charge stored on said first capacitor.
Claim 6
Dependent Claim
25 words
The offset compensating circuit of claim 2 which further includes, in said second feedback loop, a second capacitor connected across said second electronic switch means.
References Cited (Backward Citations)
US3435252A
Cited
US3937062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |