Patent US3553718A successfully refreshed from Google Patents.
US3553718A
Expired / Lapsed
US
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Multiple stylus electrolytic recorder
Assignee: TDK Micronas GmbH
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Filing: 1969-06-20
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Granted: 1971-01-05
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Expires: 1989-06-20
Abstract
Abstract AN ELECTROLYTIC SIGNAL RECORDER HAVING A PLURALITY OF RECORDING HEADS, EACH HEAD HAVING MULTIPLE SYTLI, AND A CABLE CONNECTOR HAVING A PLURALITY OF CONTACTS POSITIONED TO REGISTER WITH AND ENGAGE ALL THE SYLI INDIVIDUALLY. A RECORDING MEDIUM IS DRAWN BETWEEN SAID STYLI AMD A CONSUMABLE ELECTRODE, INCLUDING A GATING CIRCUIT FOR ACTIVATING SUCCESSIVE STYLI SEQUENTIALLY AND A STYLUS DRIVER CIRCUIT ASSOCIATED WITH EACH STYLUS FOR PROVIDING A CONSTANT AMPLITUDE CURRENT PULSE, THE DURATION OF WHICH IS PROPORTIONAL TO THE AMPLITUDE TO THE SIGNAL TO BE RECORDED, WHEREBY THE SHADING OF THE RECORDING REPRESENTS THE AMPLITUDE OF THE SIGNAL.
Inventors
- 👤 Albert E Schierhorst
- 👤 Edward H Niemeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:40
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/024; H04N1/032; H04N1/40; H04N1/405; H04N1/4055; H04N1/4056
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |