Patent US6289278B1 successfully refreshed from Google Patents.
US3196206A
Expired / Lapsed
US
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Magneto-optical transducer using a magnetic thin film
Assignee: Philips North America LLC
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Filing: 1962-01-09
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Granted: 1965-07-20
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Expires: 1982-01-09
Abstract
No abstract record available.
Inventors
- 👤 Henry W Griffiths
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:58
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/7805; H04N1/00; H04N1/23; H04N1/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A REPRODUCER UTILIZING A MAGNETO-OPTICAL EFFECT FOR TRANSDUCING SUCCESSIVE GROUPS OF MAGNETIC SIGNALS STATES RECORDED IN A MAGNETIZABLE MATERIAL INTO INFORMATION REPRESENTED BY THE SIGNAL STATES, THE REPRODUCER INCLUDING: A THIN MAGNETIC FILM DISPOSED IN MAGNETIC RELATION WITH THE MAGNETIZABLE MATERIAL TO SIMULTANEOUSLY REPRODUCE SUCCESSIVE GROUPS OF THE MAGNETIC SIGNAL STATES ON THE THIN FILM, A SOURCE OF LIGHT DISPOSED TO REFLECT LIGHT FROM AN AREA OF THE THIN FILM HAVING ONE OF THE GROUPS OF MAGNETIC SIGNAL STATES RECORDED ON THE THIN FILM, SO THAT THE REFLECTED LIGHT WILL HAVE COMPONENTS POLARIZED IN DIRECTIONS DEPENDENT UPON THE MAGNETIC STATES OF THE AREA, AND MEANS DISPOSED IN THE PATH OF THE REFLECTED LIGHT COMPONENTS FOR TRANSLATING ROTATIONS OF THE MAJOR DIRECTION FOR POLARIZATION OF THE COMPONENTS INTO THE INFORMATION REPRESENTED BY THE PATTERN OF THE MAGNETIC SIGNAL STATES.
Claim 2
Dependent Claim
138 words
A REPRODUCER UTILIZING A MAGNETO-OPTICAL EFFECT FOR TRANSDUCING SUCCESSIVE GROUPS OF MAGNETIC SIGNALS STATES RECORDED IN A MAGNETIZABLE MATERIAL INTO INFORMATION REPRESENTED BY THE SIGNAL STATES, THE REPRODUCER INCLUDING: A THIN MAGNETIC FILM DISPOSED IN MAGNETIC RELATION WITH THE MAGNETIZABLE MATERIAL TO SIMULTANEOUSLY REPRODUCE SUCCESSIVE GROUPS OF THE MAGNETIC SIGNAL STATES ON THE THIN FILM, A SOURCE OF LIGHT DISPOSED TO REFLECT LIGHT FROM AN AREA OF THE THIN FILM HAVING ONE OF THE GROUPS OF MAGNETIC SIGNAL STATES RECORDED ON THE THIN FILM, SO THAT THE REFLECTED LIGHT WILL HAVE COMPONENTS POLARIZED IN DIRECTIONS DEPENDENT UPON THE MAGNETIC STATES OF THE AREA, AND MEANS DISPOSED IN THE PATH OF THE REFLECTED LIGHT COMPONENTS FOR TRANSLATING ROTATIONS OF THE MAJOR DIRECTION FOR POLARIZATION OF THE COMPONENTS INTO THE INFORMATION REPRESENTED BY THE PATTERN OF THE MAGNETIC SIGNAL STATES.
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) | 1968-07-19 | 1969-01-18 | 1969-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-19 | 1973-01-18 | 1973-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-19 | 1977-01-18 | 1977-07-20 | $7700.00 | Window Closed / Lapsed |