Patent US6549800B1 successfully refreshed from Google Patents.
Patent US4425116A successfully refreshed from Google Patents.
US4031699A
Expired / Lapsed
US
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Port liner assembly
Assignee: Subaru Corp
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Filing: 1975-08-20
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Granted: 1977-06-28
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Expires: 1995-08-20
Abstract
Abstract A port liner assembly comprises a tubular liner embedded in a cylinder head block as its moulding so as to be integrally formed into a heat-insulation wall surrounding an exhaust port formed in said cylinder head block, said tubular liner consisting of an outer tube and an inner tube spaced inside of said outer tube.
Inventors
- 👤 Yoshiyuki Suga
- 👤 Tsutomu Kita
- 👤 Ryusuke Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:28
CPC Classifications
F; F02; F02B; F02B77/00; F02B77/02; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
111 words
A port liner assembly for internal combustion engines having at least one exhaust valve seat, comprising, a cylinder head block, an exhaust port having an inner wall provided in said cylinder head block communicating with at least one exhaust valve seat, a tubular liner provided in said exhaust port comprising an outer tube and an inner tube engaged with each other forming a hollow structure, said tubular liner having means for sliding an outer end of said inner tube relative to said outer tube, said inner tube constituting a floating tube, said inner and outer tubes having inner ends adjacent the exhaust valve seat, and said inner ends being secured together.
Claim 2
Dependent Claim
111 words
A port liner assembly for internal combustion engines having at least one exhaust valve seat, comprising, a cylinder head block, an exhaust port having an inner wall provided in said cylinder head block communicating with at least one exhaust valve seat, a tubular liner provided in said exhaust port comprising an outer tube and an inner tube engaged with each other forming a hollow structure, said tubular liner having means for sliding an outer end of said inner tube relative to said outer tube, said inner tube constituting a floating tube, said inner and outer tubes having inner ends adjacent the exhaust valve seat, and said inner ends being secured together.
Claim 3
Dependent Claim
27 words
The port liner, as set forth in claim 1, wherein said outer end of said inner tube forms an expanded annular portion slidably contacting said outer tube.
Claim 4
Dependent Claim
26 words
The port liner assembly, as set forth in claim 1, wherein each of said tubes constitutes two half shells, said half shells are mutually welded together.
Claim 5
Dependent Claim
29 words
The port liner, as set forth in claim 1, wherein said hollow structure defines a space between said outer and inner tubes, a heat insulation material filling said space.
Claim 6
Dependent Claim
37 words
The port liner, as set forth in claim 1, wherein said means is on an outer end of said tubular liner for permitting thermal expansion thereof, the latter constituting a heat insulation means for said inner wall.
Claim 7
Dependent Claim
37 words
The port liner, as set forth in claim 2, wherein said means is on an outer end of said tubular liner for permitting thermal expansion thereof, the latter constituting a heat insulation means for said inner wall.
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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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |