Patent US3139521A successfully refreshed from Google Patents.
US3139521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locating data in a magnetic recording system
Assignee: Unisys Corp
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Filing: 1961-05-05
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Granted: 1964-06-30
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Expires: 1981-05-05
Abstract
No abstract record available.
Inventors
- 👤 Jr Carl A Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:05
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
FOR STORING INFORMATION IS SELECTIVELY ENERGIZABLE PARALLEL CHANNELS ON A ROTATING CONTINOUS MAGNETIZABLE SURFACE HAVING SCATTERED AREAS OF MAGNETIC IMPERFECTIONS, WHEREIN OF SAID SURFACE, THE IMPROVEMENT COMPRISING: A PLURALITY OF SECTORIZED DATA CHANNELS, EACH SECTOR BEING EQUAL DISCRETE AREAS OF THE MAGNETIZABLE SURFACE AND INCLUDING A SECTOR-START SIGNAL STORED IN EACH OF SAID SECTORS WHICH IS FREE OF MAGNETIC IMPERFECTIONS; AN ADDITIONAL CHANNEL CONTAINING A PLURALITY OF STORED SIGNALS, THE DISPLACEMENT BETWEEN SELECTED ONES OF SAID LATTER SIGNALS REPRESENTING THE LENGTH OF SAID DATA CHANNEL SECTORS AND THE REMAINING OF SAID LATTER SIGNALS BETWEEN SAID SELECTED LATTER SIGNALS INDICATING ANGULAR STORAGE LOCATION WITHIN THE RESPECTIVE SECTORS; AND MEANS RESPONSIVE TO COINCIDENCE BETWEEN ANY ONE OF SAID SECTOR LENGTH
Claim 2
Dependent Claim
118 words
FOR STORING INFORMATION IS SELECTIVELY ENERGIZABLE PARALLEL CHANNELS ON A ROTATING CONTINOUS MAGNETIZABLE SURFACE HAVING SCATTERED AREAS OF MAGNETIC IMPERFECTIONS, WHEREIN OF SAID SURFACE, THE IMPROVEMENT COMPRISING: A PLURALITY OF SECTORIZED DATA CHANNELS, EACH SECTOR BEING EQUAL DISCRETE AREAS OF THE MAGNETIZABLE SURFACE AND INCLUDING A SECTOR-START SIGNAL STORED IN EACH OF SAID SECTORS WHICH IS FREE OF MAGNETIC IMPERFECTIONS; AN ADDITIONAL CHANNEL CONTAINING A PLURALITY OF STORED SIGNALS, THE DISPLACEMENT BETWEEN SELECTED ONES OF SAID LATTER SIGNALS REPRESENTING THE LENGTH OF SAID DATA CHANNEL SECTORS AND THE REMAINING OF SAID LATTER SIGNALS BETWEEN SAID SELECTED LATTER SIGNALS INDICATING ANGULAR STORAGE LOCATION WITHIN THE RESPECTIVE SECTORS; AND MEANS RESPONSIVE TO COINCIDENCE BETWEEN ANY ONE OF SAID SECTOR LENGTH
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) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |