Patent US3250831A successfully refreshed from Google Patents.
US3250831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic material
Assignee: General Electric Co
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Filing: 1962-12-20
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Granted: 1966-05-10
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Expires: 1982-12-20
Abstract
No abstract record available.
Inventors
- 👤 George D Hooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:03
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0253; H01F41/0273; H01F41/028; Y; Y10; Y10S; Y10S425/00; Y10S425/033; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49076
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A PROCESS FOR THE RADIAL ORIENTATION AND COMPACTION OF MAGNETIC POWDER COMPRISING ELONGATED, SINGLE DOMAIN, MAGNETIC PARTICLES INTO A RADIALLY-ORIENTED, RINGSHAPED MAGNET STRUCTURE, SAID PROCESS COMPRISING SIMULTANEOUSLY PASSING AN ALTERNATING CURRENT AND A DIRECT CURRENT FIELD THROUGH A QUANTITY OF SAID MAGNETIC POWDER RETAINED IN A STATIONARY RING-SHAPED CAVITY, SAID DIRECT CURRENT FIELD PASSING IN A RADIAL DIRECTION AND THROUGH A RADIAL PORTION ONLY OF SAID CAVITY AND SAID MAGNETIC POWDER, THE DIRECTION OF SAID DIRECT CURRENT FIELD RESULTING FROM THE CONFLUENCE OF TWO DIRECT CURRENT FIELDS OF OPPOSITE DIRECTION MEETING AT THE CENTER OF THE RADIAL PLANE OF SAID CAVITY, AND COMPACTING SAID POWDER WHILE SAID DIRECT CURRENT FIELD REMAINS ENERGIZED TO FORM A RADIALLYORIENTED, RING-SHAPED MAGNET STRUCTURE.
Claim 2
Dependent Claim
119 words
A PROCESS FOR THE RADIAL ORIENTATION AND COMPACTION OF MAGNETIC POWDER COMPRISING ELONGATED, SINGLE DOMAIN, MAGNETIC PARTICLES INTO A RADIALLY-ORIENTED, RINGSHAPED MAGNET STRUCTURE, SAID PROCESS COMPRISING SIMULTANEOUSLY PASSING AN ALTERNATING CURRENT AND A DIRECT CURRENT FIELD THROUGH A QUANTITY OF SAID MAGNETIC POWDER RETAINED IN A STATIONARY RING-SHAPED CAVITY, SAID DIRECT CURRENT FIELD PASSING IN A RADIAL DIRECTION AND THROUGH A RADIAL PORTION ONLY OF SAID CAVITY AND SAID MAGNETIC POWDER, THE DIRECTION OF SAID DIRECT CURRENT FIELD RESULTING FROM THE CONFLUENCE OF TWO DIRECT CURRENT FIELDS OF OPPOSITE DIRECTION MEETING AT THE CENTER OF THE RADIAL PLANE OF SAID CAVITY, AND COMPACTING SAID POWDER WHILE SAID DIRECT CURRENT FIELD REMAINS ENERGIZED TO FORM A RADIALLYORIENTED, RING-SHAPED MAGNET STRUCTURE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |