Patent US4848233A successfully refreshed from Google Patents.
US4848233A
Expired / Lapsed
US
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Means for protecting electroexplosive devices which are subject to a wide variety of radio frequency
Assignee: United States Department of the Navy
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Filing: 1985-10-01
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Granted: 1989-07-18
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Expires: 2005-10-01
Abstract
Abstract An RF attenuator for attenuating RF signals in a lead particularly for prcting against unintentional detonation of electrically initiated ammunition is presented. A firing lead is embedded in a body of ferrite material. The firing lead is formed in a planar spiral configuration with reversals of direction.
Inventors
- 👤 Robert L. Dow
- 👤 Paul W. Proctor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:04
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/18; F42B3/188
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
105 words
A fixed or semi-fixed ammunition comprising: an electrically initiatable primer, and means for connecting said primer to an external initiating source, said means comprising an attenuator for attenuating broad band radio frequency signals present in said means for connecting said primer to an external initiating source, said attenuator comprising a body of electrically nonconductive ferrite material, and a conductive path disposed within the body and having an input and an output terminal, the conductive path being of generally spiral form, disposed generally within a plane and in interactive relationship with the ferrite material, said input and output terminals being connectable to the means for connecting.
Claim 2
Dependent Claim
105 words
A fixed or semi-fixed ammunition comprising: an electrically initiatable primer, and means for connecting said primer to an external initiating source, said means comprising an attenuator for attenuating broad band radio frequency signals present in said means for connecting said primer to an external initiating source, said attenuator comprising a body of electrically nonconductive ferrite material, and a conductive path disposed within the body and having an input and an output terminal, the conductive path being of generally spiral form, disposed generally within a plane and in interactive relationship with the ferrite material, said input and output terminals being connectable to the means for connecting.
Claim 3
Dependent Claim
20 words
The ammunition of claim 1 wherein the spiral form of the conductive path has at least one reversal of direction.
Claim 4
Dependent Claim
111 words
A fixed or semi-fixed ammunition comprising: an electrically initiatable primer, and means for connecting said primer to an external initiating source, said means comprising an attenuator for attenuating broad band radio frequency signals present in said means for connecting said primer to an external initiating source, comprising a body of electrically nonconductive ferrite material, and a conductive path disposed within the body and having an input and an output terminal, the conductive path being of generally spiral form having at least one reversal of direction and disposed generally within a plane and in interactive relationship with the ferrite material, said input and output terminals being connectable to the means for connecting.
Claim 5
Dependent Claim
111 words
A fixed or semi-fixed ammunition comprising: an electrically initiatable primer, and means for connecting said primer to an external initiating source, said means comprising an attenuator for attenuating broad band radio frequency signals present in said means for connecting said primer to an external initiating source, comprising a body of electrically nonconductive ferrite material, and a conductive path disposed within the body and having an input and an output terminal, the conductive path being of generally spiral form having at least one reversal of direction and disposed generally within a plane and in interactive relationship with the ferrite material, said input and output terminals being connectable to the means for connecting.
Claim 6
Dependent Claim
132 words
An electroexplosive device comprising: a metal case; and an electrically initiatable primer; and means for connecting said primer to an external initiating source, said means comprising an attenuator for attenuating broad band radio frequency signals present in said means for connecting said primer to an external initiating source, the attenuator comprising a body of electrically nonconductive ferrite material sized to frictionally engage the inside of said case and transfer heat, whereby said case performs as a heat sink; and a conductive path disposed within said body of ferrite material and having an input and an output terminal, the conductive path being of generally spiral form, disposed generally within a plane and in interactive relationship with the ferrite material, the input and output terminal being connectable to said means for connecting said primer.
Claim 7
Dependent Claim
132 words
An electroexplosive device comprising: a metal case; and an electrically initiatable primer; and means for connecting said primer to an external initiating source, said means comprising an attenuator for attenuating broad band radio frequency signals present in said means for connecting said primer to an external initiating source, the attenuator comprising a body of electrically nonconductive ferrite material sized to frictionally engage the inside of said case and transfer heat, whereby said case performs as a heat sink; and a conductive path disposed within said body of ferrite material and having an input and an output terminal, the conductive path being of generally spiral form, disposed generally within a plane and in interactive relationship with the ferrite material, the input and output terminal being connectable to said means for connecting said primer.
Claim 8
Dependent Claim
21 words
The electroexplosive device of claim 4 wherein the spiral form of the conductive path has at least one reversal of direction.
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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) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |