Patent US3255447A successfully refreshed from Google Patents.
US3255447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data processing apparatus
Assignee: Epsco Inc
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Filing: 1962-01-02
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Granted: 1966-06-07
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Expires: 1982-01-02
Abstract
No abstract record available.
Inventors
- 👤 Kenneth R Sharples
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:54
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
AN ANALOG TO DIGITAL CONVERTER COMPRISING AN AMPLIFIER HAVING AN INPUT SUMMING JUNCTION, MEANS FOR APPLYING THE ANALOG SIGNAL TO THE AMPLIFIER''S SUMMING JUNCTION, A PLURALITY OF COMPARATOR COUPLED TO THE OUTPUT OF THE AMPLIFIER, EACH COMPARATOR RESIDING IN ONE OR THE OTHER OF TWO STABLE STATES, EACH COMPARATOR BEING CONNECTED TO COMPARE THE OUTPUT OF THE AMPLIFIER WITH A DIGITALLY WEIGHTED REFERENCE VOLTAGE, AND MEANS CONTROLLED BY EACH COMPARATOR FOR APPLYING A DIGITALLY WEIGHTED SIGNAL TO THE AMPLIFIER''S SUMMING JUNCTION TO CAUSE THAT JUNCTION TO BE MAINTAINED AT VIRTUAL GROUND.
Claim 2
Dependent Claim
91 words
AN ANALOG TO DIGITAL CONVERTER COMPRISING AN AMPLIFIER HAVING AN INPUT SUMMING JUNCTION, MEANS FOR APPLYING THE ANALOG SIGNAL TO THE AMPLIFIER''S SUMMING JUNCTION, A PLURALITY OF COMPARATOR COUPLED TO THE OUTPUT OF THE AMPLIFIER, EACH COMPARATOR RESIDING IN ONE OR THE OTHER OF TWO STABLE STATES, EACH COMPARATOR BEING CONNECTED TO COMPARE THE OUTPUT OF THE AMPLIFIER WITH A DIGITALLY WEIGHTED REFERENCE VOLTAGE, AND MEANS CONTROLLED BY EACH COMPARATOR FOR APPLYING A DIGITALLY WEIGHTED SIGNAL TO THE AMPLIFIER''S SUMMING JUNCTION TO CAUSE THAT JUNCTION TO BE MAINTAINED AT VIRTUAL GROUND.
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) | 1969-06-06 | 1969-12-06 | 1970-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-06 | 1973-12-06 | 1974-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-06 | 1977-12-06 | 1978-06-07 | $7700.00 | Window Closed / Lapsed |