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US3712977A
Expired / Lapsed
US
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Analog electronic multiplier,divider and square rooter using pulse-height and pulse-width modulation
Assignee: Schneider Electric Systems USA Inc
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Filing: 1971-02-03
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Granted: 1973-01-23
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Expires: 1991-02-03
Abstract
Abstract A SOLID-STATE ANALOG ELECTRONIC COMPUTING DEVICE EMPLOYING PULSE-HEIGHT, PULSE-WIDTH MODULATION HAVING A FILTERED DIFFERENTIAL AMPLIFIER WHOSE INPUTS ARE TWO TRAINS OF MODULATED PULSES, THE AVERAGE VALUE OF THE FIRST BEING PROPORTIONAL TO THE PRODUCT OF FIRST AND SECOND INPUT SIGNALS AND THE AVERAGE VALUE OF THE SECOND BEING PROPORTIONAL TO THE PRODUCT OF A THIRD INPUT SIGNAL AND THE OUTPUT OF THE DIFFERENTIAL AMPLIFIER, CONSEQUENT UPON WHICH THE OUTPUT SIGNAL IS EQUAL TO THE PRODUCT OF THE FIRST AND SECOND INPUT SIGNALS DIVIDED BY THE THIRD.
Inventors
- 👤 W Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:17
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/16; G06G7/161
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |