US3829806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered ferromagnetic core having accurately adjusted dimensions
Assignee: US Philips Corp
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Filing: 1973-08-14
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Granted: 1974-08-13
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Expires: 1993-08-14
Abstract
Abstract A sintered ferromagnetic coil core having accurately adjusted dimensions obtained by coating the cores in a mold with a layer of coating material consisting of a binder and a ferromagnetic powder.
Inventors
- 👤 F Lathouwers
- 👤 Groot J De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:44
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206; H01F41/0246; H01F27/00; H01F27/24; H01F27/255; H01F37/00; H01J; H01J9/00; H01J9/236; H01F17/00; H01F17/04; H01F2017/048; H01F41/04; H01F41/06; H01F41/071; H01F2041/0711; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071; Y10T29/49075; Y10T29/49076
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
52 words
A core having accurately adjusted dimensions for an inductance coil comprising a yoke ring of sintered ferromagnetic material having a flared inner surface, and a layer of coating material consisting of a ferromagnetic material and a binder on the flared inner surface substantially masking variations in shape and dimensions of said surface.
Claim 2
Dependent Claim
19 words
A core as claimed in claim 1 in which the coating material consists of a ferrite mixed with polythene.
Claim 3
Dependent Claim
27 words
A core as claimed in claim 2 in which the yoke ring consists of ferrite and the coating material consists of a ferrite mixed with a binder.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |