Patent US3712989A successfully refreshed from Google Patents.
US3712989A
Expired / Lapsed
US
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Peak detector
Assignee: Individual
•
Filing: 1970-09-01
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Granted: 1973-01-23
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Expires: 1990-09-01
Abstract
Abstract A LOGARITHMIC PEAK DETECTOR OPERABLE OVER WIDE AMPLITUDE AND FREQUENCY RANGES COMPRISES A FULL-WAVE RECTIFIER FOLLOWED BY A PEAK DETECTOR CIRCUIT WHICH IN TURN DRIVES A LOGARITHMIC AMPLIFIER FULL-WAVE RECTIFICATION PRIOR TO LOGARITHMIC AMPLIFICATION REDUCES BY ONE-HALF THE DYNAMIC RANGE REQUIRED OF THE LOGARITHMIC AMPLIFIER. PEAK DETECTION PRIOR TO LOGARITHMIC AMPLICATION CONSIDERABLY REDUCES THE FREQUENCY RESPONSE REQURIRED OF THE LOGARITHMIC AMPLIFIER. THE LOGARITHMIC PEAKS MAY BE STORED IN ADDITIONAL PEAK DETECTOR CIRCUITRY FOR TIME PERIODS REQUIRED BY THE MONITORING EQUIPMENT.
Inventors
- 👤 R Barton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:35
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/04
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 |