US3194894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-magnetic heads
Assignee: BSR Ltd
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Filing: 1962-05-23
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Granted: 1965-07-13
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Expires: 1982-05-23
Abstract
No abstract record available.
Inventors
- 👤 Smith Hubert Colin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:59
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/21; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9006; G11B5/147; G11B5/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
AN ELECTRO-MAGNETIC TRANSDUCER HEAD COMPRISING AN ELECTRO-MAGNET HAVING A TWO-ENDED MAGNETIZABLE CORE, THE TWO ENDS OF SAID CORE TOGETHER COMPRISING A PAIR OF INNER POLE PIECES OF OPPOSITE POLARITIES AND A PAIR OF OUTER POLE PIECES ALSO OF OPPOSITE POLARITIES, THE INNER POLE PIECES BEING BETWEEN THE OUTER POLE PIECES WITH EACH INNER POLE PIECE ADJACENT TO AN OUTER POLE PIECE OF THE SAME POLARITY AT THE SAME END OF THE CORE, A FIRST NONMAGNETIZABLE SPACER BETWEEN THE INNER POLE PIECES,TWO SECOND NON-MAGNETIZABLE SPACERS OF WHICH ONE IS LOCATED BETWEEN ONE INNER POLE PIECE AND ITS ADJACENT OUTER POLE PIECE AND OF WHICH THE OTHER IS LOCATED BETWEEN THE OTHER INNER AND OUTER POLE PIECES, THE POLE PIECES PRESENTING SUBSTANTIALLY CO-PLANAR POLE FACES AND THE NONMAGNETIZABLE SPACERS EXTENDING TO THE PLANE OF THE FACES.
Claim 2
Dependent Claim
134 words
AN ELECTRO-MAGNETIC TRANSDUCER HEAD COMPRISING AN ELECTRO-MAGNET HAVING A TWO-ENDED MAGNETIZABLE CORE, THE TWO ENDS OF SAID CORE TOGETHER COMPRISING A PAIR OF INNER POLE PIECES OF OPPOSITE POLARITIES AND A PAIR OF OUTER POLE PIECES ALSO OF OPPOSITE POLARITIES, THE INNER POLE PIECES BEING BETWEEN THE OUTER POLE PIECES WITH EACH INNER POLE PIECE ADJACENT TO AN OUTER POLE PIECE OF THE SAME POLARITY AT THE SAME END OF THE CORE, A FIRST NONMAGNETIZABLE SPACER BETWEEN THE INNER POLE PIECES,TWO SECOND NON-MAGNETIZABLE SPACERS OF WHICH ONE IS LOCATED BETWEEN ONE INNER POLE PIECE AND ITS ADJACENT OUTER POLE PIECE AND OF WHICH THE OTHER IS LOCATED BETWEEN THE OTHER INNER AND OUTER POLE PIECES, THE POLE PIECES PRESENTING SUBSTANTIALLY CO-PLANAR POLE FACES AND THE NONMAGNETIZABLE SPACERS EXTENDING TO THE PLANE OF THE FACES.
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) | 1968-07-12 | 1969-01-11 | 1969-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-12 | 1973-01-11 | 1973-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-12 | 1977-01-11 | 1977-07-13 | $7700.00 | Window Closed / Lapsed |