Patent US3973224A successfully refreshed from Google Patents.
US3973224A
Expired / Lapsed
US
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Tandem configuration for EMP protection
Assignee: United States Department of the Army
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Filing: 1975-10-28
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Granted: 1976-08-03
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Expires: 1995-10-28
Abstract
Abstract An electromagnetic pulse supressor capable of attenuating both high and lowrequency electromagnetic pulses in coaxial transmission lines. The invention utilizes a gas ionization device in combination with a metal oxide device and a biased diode and is so constructed as to allow for differing response times in each, thereby preventing damage to the overall suppressor.
Inventors
- 👤 Gerhart K. Gaule
- 👤 Paul Laplante
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:00
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/10; H02; H02H; H02H9/00; H02H9/04; H02H9/06; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
115 words
A pulse suppression circuit comprising: a transmission line having an input and an output end and having three elements connected thereto, the first element being a gas ionization device, the second element being a metal oxide device and the third element being a clamping means, said elements connected across said transmission line and arranged in a tandem configuration in the order named with the gas ionization device closest to the input end of said coaxial line, said elements being spaced sufficiently electrically distant from each other so that the propagation time between elements of an undesired pulse introduced at the input end of the line is greater than the activation time of the preceding element.
Claim 2
Dependent Claim
115 words
A pulse suppression circuit comprising: a transmission line having an input and an output end and having three elements connected thereto, the first element being a gas ionization device, the second element being a metal oxide device and the third element being a clamping means, said elements connected across said transmission line and arranged in a tandem configuration in the order named with the gas ionization device closest to the input end of said coaxial line, said elements being spaced sufficiently electrically distant from each other so that the propagation time between elements of an undesired pulse introduced at the input end of the line is greater than the activation time of the preceding element.
Claim 3
Dependent Claim
15 words
The pulse suppression circuit of claim 1 wherein the transmission line is a coaxial line.
Claim 4
Dependent Claim
26 words
The pulse suppression circuit of claim 2 wherein the clamping means comprises a reverse biased diode in series with a large capacitor having low stray inductance.
Claim 5
Dependent Claim
34 words
The pulse suppression circuit of claim 3 wherein the input end of the coaxial line is connected to an antenna and the output end of the coaxial line is connected to a utilization device.
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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |