US3167751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magneto-optic readout for magnetic data storage device
Assignee: Laboratory For Electronics Inc
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Filing: 1961-05-26
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Granted: 1965-01-26
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Expires: 1981-05-26
Abstract
No abstract record available.
Inventors
- 👤 Robert C Kelner
- 👤 Harrison W Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:12
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/09; G11; G11C; G11C13/00; G11C13/04; G11C13/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
DATA PROCESSING APPARATUS FOR PRODUCING A SIGNAL INDICATIVE OF DATA STORED IN A MAGNETIC STORAGE MEDIUM IN THE FORM OF A SEQUENCE OF OPPOSITE ORIENTED SUBSTANTIALLY PARALLEL MAGNETIC DOMAINS, COMPRISING: (A) A MAGNETIC SCANNING MEDIUM DISPOSED ADJACENT TO THE MAGNETIC STORAGE MEDIUM AND HAVING AN EASY DIRECTION OF MAGNETIZATION SUBSTANTIALLY PARALLEL TO THE MAGNETIC DOMAINS IN SUCH STORAGE MEDIUM; (B) MEANS FOR APPLYING A MAGNETIC FIELD TO THE MAGNETIC SCANNING MEDIUM TO PROPAGATE THEREIN AN INTERDOMAIN WALL SUCCESSIVELY OVERLYING INDIVIDUAL ONES OF THE DOMAINS IN THE MAGNETIC STORAGE MEDIUM; (C) MEANS FOR ILLUMINATING THE MAGNETIC SCANNING MEDIUM AND THE MAGNETIC STORAGE MEDIUM WITH PLANEPOLARIZED LIGHT DIRECTED AT AN ACUTE ANGLE TO THE SURFACE OF SUCH MEDIUMS; (D) MEANS, INCLUDING A PHOTOCELL ACTUATED BY THE PLANEPOLARIZED LIGHT THROUGH THE MAGNETIC SCANNING MEDIUM AND THE MAGNETIC STORAGE MEDIUM, FOR PRODUCING A SIGNAL HAVING A FIRST AMPLITUDE WHEN THE MAGNETIC FIELD OF THE SCANNING MEDIUM IS PARALLEL WITH THE MAGNETIC FIELD OF A DOMAIN IN THE MAGNETIC STORAGE MEDIUM AND HAVING A SECOND AMPLITUDE WHEN SUCH MAGNETIC FIELDS ARE ANTI-PARALLEL.
Claim 2
Dependent Claim
177 words
DATA PROCESSING APPARATUS FOR PRODUCING A SIGNAL INDICATIVE OF DATA STORED IN A MAGNETIC STORAGE MEDIUM IN THE FORM OF A SEQUENCE OF OPPOSITE ORIENTED SUBSTANTIALLY PARALLEL MAGNETIC DOMAINS, COMPRISING: (A) A MAGNETIC SCANNING MEDIUM DISPOSED ADJACENT TO THE MAGNETIC STORAGE MEDIUM AND HAVING AN EASY DIRECTION OF MAGNETIZATION SUBSTANTIALLY PARALLEL TO THE MAGNETIC DOMAINS IN SUCH STORAGE MEDIUM; (B) MEANS FOR APPLYING A MAGNETIC FIELD TO THE MAGNETIC SCANNING MEDIUM TO PROPAGATE THEREIN AN INTERDOMAIN WALL SUCCESSIVELY OVERLYING INDIVIDUAL ONES OF THE DOMAINS IN THE MAGNETIC STORAGE MEDIUM; (C) MEANS FOR ILLUMINATING THE MAGNETIC SCANNING MEDIUM AND THE MAGNETIC STORAGE MEDIUM WITH PLANEPOLARIZED LIGHT DIRECTED AT AN ACUTE ANGLE TO THE SURFACE OF SUCH MEDIUMS; (D) MEANS, INCLUDING A PHOTOCELL ACTUATED BY THE PLANEPOLARIZED LIGHT THROUGH THE MAGNETIC SCANNING MEDIUM AND THE MAGNETIC STORAGE MEDIUM, FOR PRODUCING A SIGNAL HAVING A FIRST AMPLITUDE WHEN THE MAGNETIC FIELD OF THE SCANNING MEDIUM IS PARALLEL WITH THE MAGNETIC FIELD OF A DOMAIN IN THE MAGNETIC STORAGE MEDIUM AND HAVING A SECOND AMPLITUDE WHEN SUCH MAGNETIC FIELDS ARE ANTI-PARALLEL.
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) | 1968-01-26 | 1968-07-27 | 1969-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-01-26 | 1972-07-27 | 1973-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-01-26 | 1976-07-27 | 1977-01-26 | $7700.00 | Window Closed / Lapsed |