US3680029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition circuit radiation suppression resistor
Assignee: NORMAN H BERRY
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Filing: 1970-12-16
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Granted: 1972-07-25
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Expires: 1990-12-16
Abstract
Abstract A wire resistor including a ceramic core and a resistor wire wrapped on the core constructed of approximately 4.5 percent aluminum, 22 percent chromium, 0.5 percent cobalt and the balance iron, which is coated with an insulating material, is positioned between an internal combustion engine ignition circuit spark plug lead and the associated spark plug for suppressing electromagnetic radiation on firing of the spark plug in the frequency range of 20-1,000 megahertz to prevent pollution of the air by extraneous radiation.
Inventors
- 👤 Norman H Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:17
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/02; H01T13/04; H01T13/05
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
25 words
Structure as set forth in claim 1 wherein the wire is approximately 4.5 percent aluminum, 22 percent chromium, 0.5 percent cobalt and the balance iron.
Claim 2
Dependent Claim
16 words
Structure as set forth in claim 1 wherein the resistor wire is approximately 70 percent iron.
Claim 3
Dependent Claim
16 words
Structure as set forth in claim 1 wherein the wire is approximately 0.0015 inches in diameter.
Claim 4
Dependent Claim
16 words
Structure as set forth in claim 1 wherein the resistor wire is approximately 18 feet long.
Claim 5
Dependent Claim
62 words
A resistor for use in automobile ignition spark plug circuits or the like comprising an insulating core and a wire coil wound on the insulating core, the wire of which is approximately 4.5 percent aluminum, 22 percent chromium, 0.5 percent cobalt and the balance iron, whereby energy is dissipated in the resistor due to the hysteresis effect of the iron content thereof.
Claim 6
Dependent Claim
17 words
Structure as set forth in claim 6 wherein the resistor wire is approximately 0.0015 inches in diameter.
Claim 7
Dependent Claim
16 words
Structure as set forth in claim 6 wherein the resistor wire is approximately 18 feet long.
Claim 8
Dependent Claim
105 words
In combination in an ignition system, a spark plug lead, a spark plug and a wire wound resistor in series between the spark plug and the spark plug lead immediately adjacent the spark plug for suppressing radiation on firing of the spark plug which resistor includes a ceramic core and a wire coil wound on the ceramic core including a substantial amount of iron whereby alternating energy created by the spark plugs in the range of 20-1,000 megahertz, in addition to that dissipated due to the resistance value of the resistor, is dissipated due to the hysteresis effect of the iron in the resistor coil.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |