Patent US4325334A successfully refreshed from Google Patents.
US4325334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prechamber cup for an internal combustion engine
Assignee: Toshiba Corp
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Filing: 1980-03-17
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Granted: 1982-04-20
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Expires: 2000-03-17
Abstract
Abstract A prechamber cup for an internal combustion engine which is made of ceramic material and designed to have a sintered and surface finished exterior wall which is to be fit in a cylinder head, a sintered and surface finished passage portion through which a gas is passed and a sintered interior wall forming cup-shaped portion.
Inventors
- 👤 Katsutoshi Nishida
- 👤 Syoji Okada
- 👤 Akio Ando
- 👤 Masato Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:10
CPC Classifications
F; F02; F02B; F02B19/00; F02B19/16; C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/58; C04B35/584; C04B35/597; F02B19/10; F02B19/1004; F02B19/165; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
62 words
A prechamber cup for insertion within a cylinder head, said cup formed of a ceramic material and including a surface finished exterior wall portion positioned within said cylinder head, a surface finished gas passage portion and a sintered non-surface finished interior wall portion forming a cup-shaped portion, said gas passage portion extending from said interior wall portion to said exterior wall portion.
Claim 2
Dependent Claim
62 words
A prechamber cup for insertion within a cylinder head, said cup formed of a ceramic material and including a surface finished exterior wall portion positioned within said cylinder head, a surface finished gas passage portion and a sintered non-surface finished interior wall portion forming a cup-shaped portion, said gas passage portion extending from said interior wall portion to said exterior wall portion.
Claim 3
Dependent Claim
32 words
A prechamber cup according to claim 1, wherein the surface roughness of said exterior wall is below 2S wherein S indicates a surface roughness in accordance with Japanese Industrial Standard B 0601.
Claim 4
Dependent Claim
35 words
A prechamber cup according to claim 1, wherein the surface roughness of said exterior wall portion is between 0.8S to 2S wherein S indicates a surface roughness in accordance with Japanese Industrial Standard B 0601.
Claim 5
Dependent Claim
33 words
A prechamber cup according to claim 1, wherein the surface roughness of said gas passage portion is below 2S wherein S indicates a surface roughness in accordance with Japanese Industrial Standard B 0601.
Claim 6
Dependent Claim
35 words
A prechamber cup according to claim 1, wherein the surface roughness of said gas passage portion is between 0.8S to 2S wherein S indicates a surface roughness in accordance with Japanese Industrial Standard B 0601.
Claim 7
Dependent Claim
38 words
A prechamber cup according to claim 1, wherein the surface roughness of said interior wall of the cup-shaped portion is between 2S to 10S wherein S indicates a surface roughness in accordance with Japanese Industrial Standard B 0601.
Claim 8
Dependent Claim
13 words
The prechamber cup according to claim 1, wherein said ceramic material comprises nitride.
Claim 9
Dependent Claim
13 words
The prechamber cup according to claim 1, wherein said ceramic material comprises carbide.
Claim 10
Dependent Claim
14 words
The prechamber cup according to claim 8, wherein said ceramic material comprises silicon carbide.
Claim 11
Dependent Claim
13 words
The prechamber cup according to claim 1, wherein said ceramic material comprises oxynitride.
Claim 12
Dependent Claim
14 words
The prechamber cup according to claim 11, wherein said ceramic material comprises silicon oxynitride.
Claim 13
Dependent Claim
15 words
The prechamber cup according to claim 11, wherein said ceramic material comprises silicon aluminum oxynitride.
Claim 14
Dependent Claim
13 words
The prechamber cup according to claim 1, wherein said ceramic material comprises carbonitride.
Claim 15
Dependent Claim
13 words
A prechamber cup according to claim 7, wherein said nitride comprises silicon nitride.
Claim 16
Dependent Claim
13 words
A prechamber cup according to claim 7, wherein said nitride comprises aluminum nitride.
Claim 17
Dependent Claim
14 words
A prechamber cup according to claim 1, wherein said ceramic material comprises glass-ceramic material.
Claim 18
Dependent Claim
16 words
A prechamber cup according to claim 1, wherein said ceramic material is formed by hot pressing.
Claim 19
Dependent Claim
16 words
A prechamber cup according to claim 1, wherein said ceramic material is formed by furnace sintering.
Claim 20
Dependent Claim
15 words
A prechamber cup according to claim 13, wherein said carbonitride comprises silicon nitride silicon carbide.
Claim 21
Dependent Claim
15 words
A prechamber cup according to claim 1, wherein said ceramic material comprises sintered ceramic material.
References Cited (Backward Citations)
GB408808A
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GB486289A
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GB724943A
Cited
US2865346A
Cited
GB845796A
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GB901983A
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GB1534761A
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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) | 1985-04-19 | 1985-10-19 | 1986-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-19 | 1989-10-19 | 1990-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-19 | 1993-10-19 | 1994-04-20 | $7700.00 | Window Closed / Lapsed |