US4426568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glow plug for diesel engines
Assignee: Denso Corp
•
Filing: 1982-05-14
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Granted: 1984-01-17
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Expires: 2002-05-14
Abstract
Abstract A glow plug for preheating the combustion chamber of a diesel engine. The glow plug has a heat generating portion and a mounting portion. The heat generating portion is provided with a ceramic central electrode made of an electrically insulating material and provided with at least one spiral screw-thread groove formed in the outer peripheral surface thereof. A ceramic electric resistor serving as a heat generating member is disposed in the groove. The electric resistor is made of TiC or SiC with or without addition of Al 2 O 3 .
Inventors
- 👤 Yoji Kato
- 👤 Shunzo Yamaguchi
- 👤 Takeshi Fukazawa
- 👤 Shinichi Saigo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:39
CPC Classifications
F; F23; F23Q; F23Q7/00; F23Q7/001; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
A glow plug for diesel engines comprising: a central rod made of alumina as an electrically insulating ceramics material; a heat generating body attached to the outer peripheral surface of said central rod integrally with said central rod, said heat generating body being made of a mixture material consisting mainly of titanium carbide as a ceramic semiconductor material and alumina added to said titanium carbide; a heat generating portion including said heat generating body and said central rod; and a mounting portion secured to the outer periphery of said central rod of said heat generating portion; wherein said heat generating body of said heat generating portion has one end and the other end, said ends constituting connecting portions for connection to electric terminals.
Claim 2
Dependent Claim
123 words
A glow plug for diesel engines comprising: a central rod made of alumina as an electrically insulating ceramics material; a heat generating body attached to the outer peripheral surface of said central rod integrally with said central rod, said heat generating body being made of a mixture material consisting mainly of titanium carbide as a ceramic semiconductor material and alumina added to said titanium carbide; a heat generating portion including said heat generating body and said central rod; and a mounting portion secured to the outer periphery of said central rod of said heat generating portion; wherein said heat generating body of said heat generating portion has one end and the other end, said ends constituting connecting portions for connection to electric terminals.
Claim 3
Dependent Claim
51 words
A glow plug for diesel engines according to claim 1, wherein at least one spiral groove is formed in the outer peripheral surface of said central rod, said heat generating body being received by said spiral groove so as to be fixed to said central rod integrally with said central rod.
Claim 4
Dependent Claim
62 words
A glow plug for diesel engines according to claim 1, wherein said one end of said heat generating body extends through said central rod to project from one end of said central rod so as to be connected to the central electrode of said glow plug while said the other end of said heat generating body is connected to said mounting portion.
References Cited (Backward Citations)
US1281744A
Cited
US1609688A
Cited
GB408917A
Cited
US2484544A
Cited
US2976505A
Cited
US3239377A
Cited
US3454345A
Cited
US3372305A
Cited
US3467812A
Cited
US3875477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |