Patent US5146044A successfully refreshed from Google Patents.
US5146044A
Expired / Lapsed
US
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Wireless detonator
Assignee: NOF Corp
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Filing: 1991-10-07
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Granted: 1992-09-08
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Expires: 2011-10-07
Abstract
Abstract A wireless detonator is disclosed that includes an antenna for receiving microwaves, a detonator provided with a heating element, and a transmission circuit. The heating element in the detonator is heated by the energy of the microwaves. The transmission circuit transmits the microwave energy from the antenna directly to the heating element. The antenna has a relative gain of 0 to 20 dB in the frequency band of the microwaves. The absolute value of the reactance component in the radiation impedance of the antenna is at most 50% of the pure resistance component of that impedance. The absolute value of the reactance component in the impedance of the heating element is at most 50% of the pure resistance component of that impedance. The pure resistance components of the radiation impedance of the antenna and of the impedance of the heating element are in a range of 70 to 130% of the characteristic impedance of the transmission circuit.
Inventors
- 👤 Koichi Kurokawa
- 👤 Kenji Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:43
CPC Classifications
F; F42; F42C; F42C13/00; F42C13/04; F42C13/047; F41; F41A; F41A19/00; F41A19/58; F41A19/63; F42C19/00; F42C19/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
147 words
A wireless detonator comprising: an antenna for receiving microwaves, the antenna having a relative gain of 0 to 20 dB in a frequency band of microwaves; a detonator including a heating element; and a transmission circuit for connecting the antenna to the heating element to directly transmit the microwave energy from the antenna to the heating element; wherein an absolute value of a reactance component in a radiation impedance of the antenna is at most 50% of a pure resistance component of the radiation impedance, an absolute value of a reactance component in an impedance of the heating element is at most 50% of a pure resistance component of the impedance, and the pure resistance components of the radiation impedance of the antenna and of the impedance of the heating element are in a range of 70 to 130% of a characteristic impedance of the transmission circuit.
Claim 2
Dependent Claim
147 words
A wireless detonator comprising: an antenna for receiving microwaves, the antenna having a relative gain of 0 to 20 dB in a frequency band of microwaves; a detonator including a heating element; and a transmission circuit for connecting the antenna to the heating element to directly transmit the microwave energy from the antenna to the heating element; wherein an absolute value of a reactance component in a radiation impedance of the antenna is at most 50% of a pure resistance component of the radiation impedance, an absolute value of a reactance component in an impedance of the heating element is at most 50% of a pure resistance component of the impedance, and the pure resistance components of the radiation impedance of the antenna and of the impedance of the heating element are in a range of 70 to 130% of a characteristic impedance of the transmission circuit.
Claim 3
Dependent Claim
27 words
A wireless detonator according to claim 1, further comprising a printed circuit board, the antenna and the transmission circuit being formed on the same printed circuit board.
Claim 4
Dependent Claim
14 words
A wireless detonator according to claim 1, wherein the antenna is a Yagi antenna.
Claim 5
Dependent Claim
21 words
A wireless detonator according to claim 1, wherein the microwaves have a frequency in the range of 2.3 to 2.6 GHz.
Claim 6
Dependent Claim
23 words
A wireless detonator according to claim 4, wherein the relative gain of the antenna is in the range of 6 to 7 dB.
Claim 7
Dependent Claim
173 words
A wireless detonator comprising: an antenna for receiving microwaves, the antenna having a relative gain of 6 to 7 dB in a microwave frequency band of 2.3 to 2.6 GHz and being formed on a printed circuit board; a detonator including a heating element; and a transmission circuit for connecting the antenna to the heating element to directly transmit the microwave energy from the antenna to the heating element, the transmission circuit being formed on the same printed circuit board as the antenna; wherein an absolute value of a reactance component in a radiation impedance of the antenna is at most 50% of a pure resistance component of the radiation impedance, an absolute value of a reactance component in an impedance of the heating element is at most 50% of a pure resistance component of the impedance, and the pure resistance components of the radiation impedance of the antenna and of the impedance of the heating element are in a range of 70 to 130% of a characteristic impedance of the transmission circuit.
Claim 8
Dependent Claim
173 words
A wireless detonator comprising: an antenna for receiving microwaves, the antenna having a relative gain of 6 to 7 dB in a microwave frequency band of 2.3 to 2.6 GHz and being formed on a printed circuit board; a detonator including a heating element; and a transmission circuit for connecting the antenna to the heating element to directly transmit the microwave energy from the antenna to the heating element, the transmission circuit being formed on the same printed circuit board as the antenna; wherein an absolute value of a reactance component in a radiation impedance of the antenna is at most 50% of a pure resistance component of the radiation impedance, an absolute value of a reactance component in an impedance of the heating element is at most 50% of a pure resistance component of the impedance, and the pure resistance components of the radiation impedance of the antenna and of the impedance of the heating element are in a range of 70 to 130% of a characteristic impedance of the transmission circuit.
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) | 1995-09-08 | 1996-03-09 | 1996-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-08 | 2000-03-09 | 2000-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-08 | 2004-03-09 | 2004-09-08 | $7700.00 | Window Closed / Lapsed |