Patent US2171861A successfully refreshed from Google Patents.
US3104364A
Expired / Lapsed
US
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Magnetic core construction
Assignee: HK Porter Co Inc
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Filing: 1957-05-07
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Granted: 1963-09-17
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Expires: 1977-05-07
Abstract
No abstract record available.
Inventors
- 👤 Jr Joseph W Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:40
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/24; H01F27/245; H01F27/2455; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A MAGNETIC CORE FOR ELECTRIC INDUCTION APPARATUS COMPRISING A PLURALITY OF CONCENTRICALLY STACKED SPIRALLY WOUND CORE-FORMING ELEMENTS FORMED OF MAGNETIC SHEET MATERIAL, ALL OF SAID ELEMENTS BEING OF A GENERALLY RECTANGULAR, HOLLOW CONFIGURATION CONFORMING GENERALLY TO THE CROSS-SECTIONAL SHAPE OF THE COIL EMBRACED BY THE MAGNETIC CORE, EACH SUCH SPIRALLY WOUND ELEMENT INCLUDING SUBSTANTIALLY MORE THAN A SINGLE WHOLE TURN AND BEING OF SUCH CONVOLUTE LENGTH THAT IN THE CONCENTRIC STACK THEREOF THE PROXIMATE ENDS OF ADJOINING ELEMENTS ARE OVERLAPPED TO FORM JOINTS WHICH RESPECTIVELY LIE BETWEEN NON-JOINTED LENGTHS OF THE SHEET MATERIAL FORMING THE CORE.
Claim 2
Dependent Claim
96 words
A MAGNETIC CORE FOR ELECTRIC INDUCTION APPARATUS COMPRISING A PLURALITY OF CONCENTRICALLY STACKED SPIRALLY WOUND CORE-FORMING ELEMENTS FORMED OF MAGNETIC SHEET MATERIAL, ALL OF SAID ELEMENTS BEING OF A GENERALLY RECTANGULAR, HOLLOW CONFIGURATION CONFORMING GENERALLY TO THE CROSS-SECTIONAL SHAPE OF THE COIL EMBRACED BY THE MAGNETIC CORE, EACH SUCH SPIRALLY WOUND ELEMENT INCLUDING SUBSTANTIALLY MORE THAN A SINGLE WHOLE TURN AND BEING OF SUCH CONVOLUTE LENGTH THAT IN THE CONCENTRIC STACK THEREOF THE PROXIMATE ENDS OF ADJOINING ELEMENTS ARE OVERLAPPED TO FORM JOINTS WHICH RESPECTIVELY LIE BETWEEN NON-JOINTED LENGTHS OF THE SHEET MATERIAL FORMING THE CORE.
References Cited (Backward Citations)
US2305649A
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US2305650A
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US2344294A
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US2355137A
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US2543089A
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US2489625A
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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) | 1966-09-16 | 1967-03-18 | 1967-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-16 | 1971-03-18 | 1971-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-16 | 1975-03-18 | 1975-09-17 | $7700.00 | Window Closed / Lapsed |