Patent US2643226A successfully refreshed from Google Patents.
US3147462A
Expired / Lapsed
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Control system for magnetic memory drum
Assignee: General Precision Inc
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Filing: 1961-01-03
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Granted: 1964-09-01
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Expires: 1981-01-03
Abstract
No abstract record available.
Inventors
- 👤 Donald B Levinson
- 👤 Lindell Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:23
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
138 words
A CONTROL SYSTEM FOR USE WITH A ROTATABLE MAGNETIC MEMORY DRUM HAVING A SERIES OF IMPULSES RECORDED IN A TRACK THEREON, SAID CONTROL SYSTEM INCLUDING: READING CIRCUIT MEANS MAGNETICALLY COUPLED TO SAID TRACK ON SAID DRUM FOR PRODUCING IN RESPONSE TO THE IMPULSE RECORDED THEREIN A SERIES OF ELECTRICAL PULSES HAVING A REPETITION FREQUENCY DEPENDENT UPON THE ROTATIONAL SPEED AT THE MEMORY DRUM, MONOSTABLE MULTIVIBRATOR MEANS COUPLED TO SAID READING CIRCUIT MEANS AND RESPONSIVE TO SAID SERIES OF ELECTRICAL PULSES FOR PRODUCING A RECTANGULAR WAVE OUTPUT SIGNAL, REFERENCE FREQUENCY GENERATOR MEANS FOR PRODUCING A SERIES OF REFERENCE ELECTRICAL PULSES HAVING A PRE-DETERMINED INVARIABLE REFERENCE REPETITION FREQUENCY, GATE CIRCUIT MEANS COUPLED TO SAID MONOSTABLE MULTIVIBRATOR AND TO SAID REFERENCE FREQUENCY GENERATOR AND RESPONSIVE TO SAID RECTANGULAR WAVE SIGNAL AND TO SAID REFERENCE PULSES FOR PRODUCING AN OUTPUT CONTROL SIGNAL
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |