US3564538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple slope analog to digital converter
Assignee: General Electric Co
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Filing: 1968-01-29
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Granted: 1971-02-16
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Expires: 1988-01-29
Abstract
Abstract A CAPACITOR IS CHARGED TO A POTENTIAL PROPORTIONAL TO AN ANALOG VOLTAGE TO BE CONVERTED TO A DIGITAL FORM. IT IS FIRST DISHCHARGED THROUGH THE LEVEL OF A REFERENCE POTENTIAL BY A RELATIVELY HIGH CONSTANT CURRENT, IT IS NEXT DISCHARGED IN THE REVERSE DIRECTION THROUGH THE REFERENCE POTENTIAL BY A LASSER CONSTANT CURRENT, AND IT IS FINALLY DISCHARGED IN THE FIRST DIRECTION THROUGH THE REFERENCE POTENTIAL BY A RELATIVELY LOW CONSTANT CURRENT. THE DURATIONS OF EACH OF THE DISCHARGING CURRENTS ARE MEASURED, WITH APPROPRIATE WEIGHTINGS GIVEN THE HIGHER CURRENTS, PRODUCING AN ACCURACY EQIVALENT TO THAT ATTAINABLE IF ONLY THE RELATIVELY LOW CURRENT WERE EMPLOYED.
Inventors
- 👤 Frederick Bondzeit
- 👤 Lewis J Neelands
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:42
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/14; H03M1/16; H03M1/162; H03M1/50; H03M1/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |