US3205415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet device
Assignee: Hitachi Ltd
•
Filing: 1962-12-24
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Granted: 1965-09-07
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Expires: 1982-12-24
Abstract
No abstract record available.
Inventors
- 👤 Seki Takeo
- 👤 Suzuki Yoshihisa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:39
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/58; H01J29/64; H01J29/68; H01F; H01F7/00; H01F7/02; H01F7/0273; H01F7/0278
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A PERMANENT MAGNET DEVICE FOR PRODUCING A UNIFORM MAGNETIC FIELD WITHIN A DEFINED MAGNETIC FIELD SPACE COMPRISING A SUBSTANTIALLY CYLINDRICAL HOLLOW MAGNET MEANS SURROUNDING SAID MAGNETIC FIELD SPACE FOR PRODUCING SAID UNIFORM MAGNETIC FIELD THEREIN, AND SHIELD MEANS SUBSTANTIALLY COMPLETELY ENCLOSING SAID MAGNET MEANS, SAID MAGNET MEANS CONSISTING OF A PLURALITY OF ANNULAR MAGNET MEMBERS WITH THEIR RESPECTIVE DIRECTIONS OF MAGNETIZATION ARRANGED SO THAT THE MAGNETIC POLARITYY OVER ONE-HALF OF THE OUTER SURFACE OF SAID MAGNET MEANS IS OPPOSITE THE MAGNETIC POLARITY OVER THE OTHER HALF OF THE OUTER SURFACE OF SAID MAGNET MEANS.
Claim 2
Dependent Claim
94 words
A PERMANENT MAGNET DEVICE FOR PRODUCING A UNIFORM MAGNETIC FIELD WITHIN A DEFINED MAGNETIC FIELD SPACE COMPRISING A SUBSTANTIALLY CYLINDRICAL HOLLOW MAGNET MEANS SURROUNDING SAID MAGNETIC FIELD SPACE FOR PRODUCING SAID UNIFORM MAGNETIC FIELD THEREIN, AND SHIELD MEANS SUBSTANTIALLY COMPLETELY ENCLOSING SAID MAGNET MEANS, SAID MAGNET MEANS CONSISTING OF A PLURALITY OF ANNULAR MAGNET MEMBERS WITH THEIR RESPECTIVE DIRECTIONS OF MAGNETIZATION ARRANGED SO THAT THE MAGNETIC POLARITYY OVER ONE-HALF OF THE OUTER SURFACE OF SAID MAGNET MEANS IS OPPOSITE THE MAGNETIC POLARITY OVER THE OTHER HALF OF THE OUTER SURFACE OF SAID MAGNET MEANS.
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) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |