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US4001145A Expired / Lapsed US ⏱️ 0.0 years remaining

Glassy resistor composition for use in a resistor incorporated spark plug

Assignee: Niterra Co Ltd
•
Filing: 1974-11-18
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Granted: 1977-01-04
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Expires: 1994-11-18
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Abstract

Abstract A glassy resistor composition for use in a resistor incorporated spark plug is prepared by mixing 100 parts by weight of a mixture of 1-40% by weight of at least one of semiconductible oxides of metals selected from groups IVa and Va of the Periodic Table and a group of rare earth metals, 35-85% by weight of a glass powder and 5-35% by weight of a metal powder after a calcination, drying the resulting mixture, calcining the dried mixture and granulating the resulting mixture to form a base component, and compounding 100 parts by weight of the formed base component with 0.1-30 parts by weight of at least one of powdery carbides serving as reducing agents for the oxides and 0.1-20 parts by weight of inorganic or organic binder.

Inventors

  • 👤 Masao Sakai
  • 👤 Masaru Fukuoka
  • 👤 Katsuyoshi Hayashi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 21:59
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/40; H01T13/41

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 117 words
A glassy resistor composition for use in a resistor incorporated spark plug formed by mixing 100 parts by weight of a mixture of 1-40% by weight of at least one semiconductible oxide selected from group consisting of TiO 2 , Nb 2 O 5 , ThO 2 and La 2 O 3 ; 35-85% by weight of a glass powder; and 5-35% by weight of at least one metal powder selected from group consisting of Cu, Ag, Mn, Cr, Fe and an alloy of FeB; with 0.1-30 parts by weight of at least one powdery carbide selected from the group consisting of TiC, B 4 C, SiC and TaC; serving as a reducing agent for said oxides.
Claim 2
Dependent Claim 117 words
A glassy resistor composition for use in a resistor incorporated spark plug formed by mixing 100 parts by weight of a mixture of 1-40% by weight of at least one semiconductible oxide selected from group consisting of TiO 2 , Nb 2 O 5 , ThO 2 and La 2 O 3 ; 35-85% by weight of a glass powder; and 5-35% by weight of at least one metal powder selected from group consisting of Cu, Ag, Mn, Cr, Fe and an alloy of FeB; with 0.1-30 parts by weight of at least one powdery carbide selected from the group consisting of TiC, B 4 C, SiC and TaC; serving as a reducing agent for said oxides.
Claim 3
Dependent Claim 30 words
A glassy resistor composition as claimed in claim 1, further comprising 0.1-20 parts by weight of an inorganic or organic binder based on 100 parts by weight of said mixture.
Claim 4
Dependent Claim 18 words
A glassy resistor composition as claimed in claim 1, wherein said glass powder comprises a borosilicate series glass.
Claim 5
Dependent Claim 23 words
A glassy resistor composition as claimed in claim 3, wherein said glass powder comprises a SiO 2 , B 2 O 3 glass.
Claim 6
Dependent Claim 33 words
A glassy resistor composition as claimed in claim 4, wherein said glass powder consists of 65% by weight SiO 2 , 30% by weight B 2 O 3 and 5% by weight PbO.

References Cited (Backward Citations)

US3484284A Cited
US3680029A Cited
US3875477A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-01-04 1980-07-05 1981-01-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-01-04 1984-07-05 1985-01-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-01-04 1988-07-05 1989-01-04 $7700.00 Window Closed / Lapsed

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