Patent US4214210A successfully refreshed from Google Patents.
US4214210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic noise source locator
Assignee: Sprague Electric Co
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Filing: 1978-01-09
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Granted: 1980-07-22
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Expires: 1998-01-09
Abstract
Abstract An electromagnetic noise source locator is comprised of an audio amplifier which is connected to drive a speaker and to which is connected at the input a series circuit that includes a very small antenna loop of area less than 1 in2, a diode and a capacitor. This apparatus responds only to bursts of radiated energy and furthermore responds only to such bursts having frequency components over about 1 GHz. It is therefore particularly suitable for the selective sensing and location of sparking gaps as may occur on power lines.
Inventors
- 👤 Martin W. O'Shea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:19
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/26; G01R19/00; G01R19/145; G01R31/00; G01R31/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
125 words
An apparatus for locating the source of sparking electromagnetic noise radiation comprising: (a) an indicator means for producing an indication of the presence of an electrical signal; (b) an audio amplifier, an output thereof being electrically connected to said indicator means; and (c) an r.f. antenna-detector means comprising a conductive loop, a diode, a capacitor and a coaxial cable that has a center conductor and a cylindrical outer conductor, said loop having an area of less than 1 square inch and being connected between said conductors at one end of said cable with said diode forming a part of said loop; said loop, said diode, said capacitor and said cable conductors forming a series circuit which is connected across the input of said audio amplifier.
Claim 2
Independent Claim
125 words
An apparatus for locating the source of sparking electromagnetic noise radiation comprising: (a) an indicator means for producing an indication of the presence of an electrical signal; (b) an audio amplifier, an output thereof being electrically connected to said indicator means; and (c) an r.f. antenna-detector means comprising a conductive loop, a diode, a capacitor and a coaxial cable that has a center conductor and a cylindrical outer conductor, said loop having an area of less than 1 square inch and being connected between said conductors at one end of said cable with said diode forming a part of said loop; said loop, said diode, said capacitor and said cable conductors forming a series circuit which is connected across the input of said audio amplifier.
Claim 3
Dependent Claim
31 words
The apparatus of claim 1 wherein said amplifier and the portion of said antenna-detector means that is connected between said amplifier input and said cable are enclosed in a metal case.
Claim 4
Dependent Claim
38 words
The apparatus of claim 1 wherein said amplifier is comprised of a plurality of audio amplifier stages being connected in tandem, said amplifier including a gain adjusting means for permitting manual adjustment of the gain of said amplifier.
Claim 5
Dependent Claim
20 words
The apparatus of claim 1 additionally comprising a pulse stretching means for widening signal pulses that pass through said amplifier.
Claim 6
Dependent Claim
13 words
The apparatus of claim 1 wherein said indicator means is an electro-acoustic transducer.
Claim 7
Dependent Claim
27 words
The apparatus of claim 1 additionally comprising a signal threshold means in said amplifier for passing only signals having a magnitude greater than a certain threshold voltage.
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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) | 1983-07-22 | 1984-01-21 | 1984-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-22 | 1988-01-21 | 1988-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-22 | 1992-01-21 | 1992-07-22 | $7700.00 | Window Closed / Lapsed |