Patent US4145968A successfully refreshed from Google Patents.
US4145968A
Expired / Lapsed
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Device for the contactless transmission of electrical energy, in particular for pyrotechnic ignitors or firing devices
Assignee: CSEE-DEFENSE
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Filing: 1977-08-10
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Granted: 1979-03-27
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Expires: 1997-08-10
Abstract
Abstract An inductive energy transmission device for firing an igniter which has primary and secondary windings and a fixed magnetic screen designed to be generated by the primary winding.
Inventors
- 👤 Denys C. Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:01
CPC Classifications
H; H01; H01F; H01F19/00; H01F19/02; F; F41; F41A; F41A19/00; F41A19/58; F41A19/63
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
108 words
A device for the contactless transmission of electrical energy, intended in particular for firing an ignitor connected to a pyrotechic charge, of the type comprising a fixed control primary winding capable of being supplied with alternating current, and a secondary winding connected to the ignitor and mounted on the pyrotechnic charge within a magnetic circuit which is itself enclosed in a protective shield against stray induction currents there being an air gap between said windings, characterized in that the said shield comprises a fixed magnetic screen of saturable iron designed so as to be saturated in the presence of the magnetic control flux generated by the primary winding.
Claim 2
Independent Claim
108 words
A device for the contactless transmission of electrical energy, intended in particular for firing an ignitor connected to a pyrotechic charge, of the type comprising a fixed control primary winding capable of being supplied with alternating current, and a secondary winding connected to the ignitor and mounted on the pyrotechnic charge within a magnetic circuit which is itself enclosed in a protective shield against stray induction currents there being an air gap between said windings, characterized in that the said shield comprises a fixed magnetic screen of saturable iron designed so as to be saturated in the presence of the magnetic control flux generated by the primary winding.
Claim 3
Dependent Claim
50 words
The device according to claim 1, characterised in that the secondary winding is completely enclosed in a shell of an extremely electrically conducting metal which is thinner at right-angles to the air gap so as to form an electrical screen against which is placed the magnetic screen of saturable iron.
Claim 4
Dependent Claim
26 words
The device according to claim 1, characterised in that the thickness of the magnetic screen of saturable iron decreases progressively as a function of its radius.
Claim 5
Dependent Claim
26 words
The device according to claim 2, characterized in that the thickness of the magnetic screen of saturable iron decreases progressively as a function of its radius.
References Cited (Backward Citations)
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Cited
US2640417A
Cited
US3038384A
Cited
US2690124A
Cited
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Cited
US3809964A
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-26 | 1982-09-25 | 1983-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-26 | 1986-09-25 | 1987-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-26 | 1990-09-25 | 1991-03-27 | $7700.00 | Window Closed / Lapsed |