Patent US3721883A successfully refreshed from Google Patents.
US3721883A
Expired / Lapsed
US
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Servo control circuit
Assignee: Leica Microsystems Inc
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Filing: 1971-06-30
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Granted: 1973-03-20
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Expires: 1991-06-30
Abstract
Abstract SERVO CONTROL CIRCUITRY FOR CONTROLLING THE MOVEMENT OF A RECORDING PEN INCLUDING MEANS FOR AMPLIFYING AN INPUT SIGNAL TO DRIVE THE RECORDING PEN TO RESPOND LINEARLY OVER A WIDE FREQUENCY AND AMPLITUDE RANGE OF THE INPUT SIGNAL AND DAMPING THE MOVEMENT OF THE RECORDING PEN TO PREVENT OSCILLATION THEREOF.
Inventors
- 👤 C Whitmore
- 👤 G Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:07
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1427
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |