Patent JPH03217640A successfully refreshed from Google Patents.
US3750069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low reluctance inductor
Assignee: Coilcraft Inc
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Filing: 1972-02-22
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Granted: 1973-07-31
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Expires: 1992-02-22
Abstract
Abstract A closed magnetic circuit, high inductance device characterized by minimum reluctance and low cost of manufacture.
Inventors
- 👤 J Renskers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:45
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H01F17/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
An inductive device comprising a brittle, sintered cylindrical core, a winding thereon, and a brittle, sintered shell having side wall, end walls and a cavity therewithin containing said core and enclosing said winding, said shell being longitudinally divided on a plane containing the axis of said core and having arcuate notches in the free edges of the end walls thereof conforming to and encompassing the cylindrical ends of said core, said notches being less than semicircular so that the facing edges of said shell parts are spaced narrowly apart when said core is contained in said notches, adhesive means spanning said facing edges of said shell parts to secure said shell parts together and in direct contact with said cylindrical ends of said core, said device being characterized by the absence of adhesive between said core and said notches.
Claim 2
Dependent Claim
139 words
An inductive device comprising a brittle, sintered cylindrical core, a winding thereon, and a brittle, sintered shell having side wall, end walls and a cavity therewithin containing said core and enclosing said winding, said shell being longitudinally divided on a plane containing the axis of said core and having arcuate notches in the free edges of the end walls thereof conforming to and encompassing the cylindrical ends of said core, said notches being less than semicircular so that the facing edges of said shell parts are spaced narrowly apart when said core is contained in said notches, adhesive means spanning said facing edges of said shell parts to secure said shell parts together and in direct contact with said cylindrical ends of said core, said device being characterized by the absence of adhesive between said core and said notches.
References Cited (Backward Citations)
US1673062A
Cited
US1815380A
Cited
FR897517A
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GB662909A
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US2801293A
Cited
US3028570A
Cited
DE1564556A1
Cited
US3500274A
Cited
US3585553A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |