Patent US3284785A successfully refreshed from Google Patents.
US3284785A
Expired / Lapsed
US
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Magneto-optic readout detector
Assignee: International Business Machines Corp
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Filing: 1963-07-16
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Granted: 1966-11-08
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Expires: 1983-07-16
Abstract
No abstract record available.
Inventors
- 👤 Kornei Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:29
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11C13/06; G11B; G11B11/00; G11B11/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
MAGNETIC RECORD REPRODUCING APPARATUS COMPRISING, A SPECULARLY REFLECTIVE MAGNETIC RECORD HAVING DISCRETE MAGNETIZED AREAS THEREON RESPRESENTATIVE OF DIGITAL INFORMATION, MEANS FOR BEAMING LIGHT ONTO SAID MAGNETIC RECORD, MEANS FOR MOVING SAID MAGNETIC RECORD WITH RESPECT TO SAID LIGHT BEAM WHEREBY SAID DISCRETE MAGNETIZED AREAS PASS BY THE POINT OF IMPINGEMENT OF SAID LIGHT BEAM UPON SAID RECORD, LIGHT POLARIZING MEANS INTERPOSED IN THE PATH OF SAID IMPINGING LIGHT, A PHOTORESPONSIVE DEVICE ARRANGED TO RECEIVE LIGHT REFLECTED FROM SAID DISCRETE AREAS, LIGHT ANALYZING MEANS INTERPOSED IN THE PATH OF SAID REFLECTED LIGHT, MEANS INTERPOSED IN THE PATH OF SAID LIGHT BETWEEN SAID POLARIZER AND SAID ANALYZER OF IMPARTING PERIODIC ROTATION TO THE POLARIZATION OF SAID LIGHT BEAM, AND PHASE DETECTING MEANS COUPLED TO SAID PHOTORESPONSIVE DEVICE FOR PRODUCING AN ELECTRIC OUTPUT SIGNAL CORRESPONDING TO THE MAGNETIZATION OF SAID DISCRETE MAGNETIZED AREAS AS THEY PASS BENEATH SAID POINT OF IMPINGEMENT OF SAID LIGHT BEAM.
Claim 2
Dependent Claim
152 words
MAGNETIC RECORD REPRODUCING APPARATUS COMPRISING, A SPECULARLY REFLECTIVE MAGNETIC RECORD HAVING DISCRETE MAGNETIZED AREAS THEREON RESPRESENTATIVE OF DIGITAL INFORMATION, MEANS FOR BEAMING LIGHT ONTO SAID MAGNETIC RECORD, MEANS FOR MOVING SAID MAGNETIC RECORD WITH RESPECT TO SAID LIGHT BEAM WHEREBY SAID DISCRETE MAGNETIZED AREAS PASS BY THE POINT OF IMPINGEMENT OF SAID LIGHT BEAM UPON SAID RECORD, LIGHT POLARIZING MEANS INTERPOSED IN THE PATH OF SAID IMPINGING LIGHT, A PHOTORESPONSIVE DEVICE ARRANGED TO RECEIVE LIGHT REFLECTED FROM SAID DISCRETE AREAS, LIGHT ANALYZING MEANS INTERPOSED IN THE PATH OF SAID REFLECTED LIGHT, MEANS INTERPOSED IN THE PATH OF SAID LIGHT BETWEEN SAID POLARIZER AND SAID ANALYZER OF IMPARTING PERIODIC ROTATION TO THE POLARIZATION OF SAID LIGHT BEAM, AND PHASE DETECTING MEANS COUPLED TO SAID PHOTORESPONSIVE DEVICE FOR PRODUCING AN ELECTRIC OUTPUT SIGNAL CORRESPONDING TO THE MAGNETIZATION OF SAID DISCRETE MAGNETIZED AREAS AS THEY PASS BENEATH SAID POINT OF IMPINGEMENT OF SAID LIGHT BEAM.
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) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |