US3156871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording system employing means for generating correction pulses only between consecutive similar information pulses
Assignee: Unisys Corp
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Filing: 1962-01-11
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Granted: 1964-11-10
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Expires: 1982-01-11
Abstract
No abstract record available.
Inventors
- 👤 James A Fraunfelder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:00
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1488; G11B20/1492
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A SYSTEM FOR GENERATING A SERIES OF INFORMATION SIGNALS REPRESENTED BY PULSES OF EITHER A FIRST OR SECOND TYPE COMPRISING MEANS FOR GENERATING A PULSE SIGNAL BETWEEN TWO CONSECUTIVE INFORMATION SIGNALS WHENEVER SAID CONSECUTIVE SIGNALS ARE OF THE SAME TYPE, SAID PULSE SIGNAL BEING OF THE OPPOSITE TYPE TO SAID CONSECUTIVE PULSES, AND MEANS FOR PREVENTING SAID PULSE SIGNAL FROM BEING GENERATED IF SAID CONSECUTIVE SIGNALS ARE OF DIFFERENT TYPES.
Claim 2
Independent Claim
70 words
A SYSTEM FOR GENERATING A SERIES OF INFORMATION SIGNALS REPRESENTED BY PULSES OF EITHER A FIRST OR SECOND TYPE COMPRISING MEANS FOR GENERATING A PULSE SIGNAL BETWEEN TWO CONSECUTIVE INFORMATION SIGNALS WHENEVER SAID CONSECUTIVE SIGNALS ARE OF THE SAME TYPE, SAID PULSE SIGNAL BEING OF THE OPPOSITE TYPE TO SAID CONSECUTIVE PULSES, AND MEANS FOR PREVENTING SAID PULSE SIGNAL FROM BEING GENERATED IF SAID CONSECUTIVE SIGNALS ARE OF DIFFERENT TYPES.
References Cited (Backward Citations)
US2954267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-10 | 1968-05-11 | 1968-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-10 | 1972-05-11 | 1972-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-10 | 1976-05-11 | 1976-11-10 | $7700.00 | Window Closed / Lapsed |