US4482475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistor composition for resistor-incorporated spark plugs
Assignee: Niterra Co Ltd
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Filing: 1983-07-15
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Granted: 1984-11-13
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Expires: 2003-07-15
Abstract
Abstract A resistor composition for spark plugs comprises 100 wt parts of base mixture of 30-70 wt glass frit with the balance being an inorganic aggregate, 0.1-10 wt parts of carbonaceous material calculated as carbon, 0-30 wt parts of stabilizing agent for resistance under load and 0.1-15 wt parts of boron, boric acid and/or a borate. This composition reduces pores on sealing.
Inventors
- 👤 Masao Sakai
- 👤 Yasuhiko Suzuki
- 👤 Makoto Sugimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:08
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/40; H01T13/41
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
131 words
A resistor composition for resistor-incorporated spark plugs comprising: 100 parts by weight of a base mixture composed of 30-70% by weight of glass frit with the balance being an inorganic aggregate comprising alumina, zircon, mullite, silica, fused silica, magnesia, clay, silicon nitride, aluminium nitride, boron nitride or mixtures thereof; 0.1-10.0 parts by weight of a carbonaceous material calculated as carbon upon calcination; 0-30 parts by weight of a stabilizing agent for resistance under load consisting of one or more selected from the group consisting of oxides and carbides of rare earth elements and metals from Subgroup IVa, Va and VIa of the periodic table, ZnO, B 4 C, SiC, TiB and TiN; and, 0.1 to 15 parts by weight of one or more of boron oxide, boric acid and a borate.
Claim 2
Dependent Claim
131 words
A resistor composition for resistor-incorporated spark plugs comprising: 100 parts by weight of a base mixture composed of 30-70% by weight of glass frit with the balance being an inorganic aggregate comprising alumina, zircon, mullite, silica, fused silica, magnesia, clay, silicon nitride, aluminium nitride, boron nitride or mixtures thereof; 0.1-10.0 parts by weight of a carbonaceous material calculated as carbon upon calcination; 0-30 parts by weight of a stabilizing agent for resistance under load consisting of one or more selected from the group consisting of oxides and carbides of rare earth elements and metals from Subgroup IVa, Va and VIa of the periodic table, ZnO, B 4 C, SiC, TiB and TiN; and, 0.1 to 15 parts by weight of one or more of boron oxide, boric acid and a borate.
Claim 3
Dependent Claim
157 words
A resistor composition for resistor-incorporated spark plugs comprising: 100 parts by weight of a base mixture composed of 30-70% by weight of glass frit with the balance being an inorganic aggregate comprising alumina, zircon, mullite, silica, fused silica, magnesia, clay, silicon nitride, aluminum nitrides, boron nitride or mixtures thereof; 0.1-10.0 parts by weight of a carbonaceous material calculated as carbon upon calcination; 0-30 parts by weight of a stabilizing agent for resistance under load consisting of one or more selected from the group consisting of oxides and carbides of rare earth elements, and metals from Subgroups IVa, Va and VIa of the periodic table, ZnO, B 4 C, SiC, TiB and TiN; 0.1 to 15 parts by weight of one or more of boron oxide, boric acid and a borate; and 1-100% by weight of said aggregate being mixed and calcined with said carbonaceous material prior to being mixed with the remaining ingredients of the resistor composition.
Claim 4
Dependent Claim
157 words
A resistor composition for resistor-incorporated spark plugs comprising: 100 parts by weight of a base mixture composed of 30-70% by weight of glass frit with the balance being an inorganic aggregate comprising alumina, zircon, mullite, silica, fused silica, magnesia, clay, silicon nitride, aluminum nitrides, boron nitride or mixtures thereof; 0.1-10.0 parts by weight of a carbonaceous material calculated as carbon upon calcination; 0-30 parts by weight of a stabilizing agent for resistance under load consisting of one or more selected from the group consisting of oxides and carbides of rare earth elements, and metals from Subgroups IVa, Va and VIa of the periodic table, ZnO, B 4 C, SiC, TiB and TiN; 0.1 to 15 parts by weight of one or more of boron oxide, boric acid and a borate; and 1-100% by weight of said aggregate being mixed and calcined with said carbonaceous material prior to being mixed with the remaining ingredients of the resistor composition.
Claim 5
Dependent Claim
18 words
The resistor composition of claim 2, wherein the calcination is carried out at a temperature of 500°-1300° C.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
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