Protective rf attenuator plug for wire-bridge detonators
Abstract
Abstract THE PLUG PORTION OF A WIRE-BRIDGE DETONATOR IS REPLACED WITH A FILTER OF THE SAME PHYSICAL SHAPE AND SIZE. THE INPUT CONDUCTORS FOR THE BRIDGE WIRE ARE EACH SURROUNDED BY A SERIES OF CLOSELY SPACED FERRITE BEADS. A CONDUCTIVE SHIELD PLATE IS PROVIDED BETWEEN THE CONDUCTORS FROM WHICH THE FERRITE BEADS ARE INSULATED BY A STRIP OF CERAMIC MATERIAL ON EACH SIDE OF THE SHIELD PLATE. THE PLUG IS PROVIDED WITH END SHIELDS OF CONDUCTING MATEIRAL AND AN OUTER SHIELD CASING WHICH MAY BE OF STEEL OR OTHER CONDUCTING MATERIAL. THE FERRITE BEADS AND THE CERAMIC STRIPS PROVIDE THE INDUCTIVE AND CAPACITIVE ELEMENTS OF AN RF FILTER OR ATTENUATOR ON THE INPUT CONDUCTORS WHICH OPERATES TO ABSORB STRAY RADIATED ELECTROMAGNETIC ENERGY THAT MIGHT BE PICKED UP BY THESE CONDUCTORS, AND PREVENTS THIS ENERGY FROM PASSING THROUGH TO THE BRIDGE WIRE WHICH MIGHT THUS BE PREMATURELY FIRED THEREBY.
Inventors
- 👤 Theodore Warshall
Bibliographic Details
Claims Analysis
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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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |