US4346556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating engine exhaust port liner
Assignee: Motors Liquidation Co
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Filing: 1980-05-12
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Granted: 1982-08-31
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Expires: 2000-05-12
Abstract
Abstract An insulating liner for use in an exhaust port of an internal combustion engine or the like consisting, in a preferred embodiment, of a formed thin wall tubular body of rigidized fibrous ceramic such as fibrous alumina-silica material (Fiberfrax) with an abrasion resistant ceramic coating fused onto the inner gas-exposed surface of the body. The coating comprises a mixture of fused silica cement and fine glass frit sintered in place on the body inner surface at a temperature below that which would damage the thin walls of the body.
Inventors
- 👤 Hal H. Rice
- 👤 Gary A. Kruger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:58
CPC Classifications
F; F02; F02B; F02B77/00; F02B77/02; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1317
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
An insulating exhaust port liner for internal combustion engines and the like, said liner comprising a formed thin wall body of rigidized fibrous ceramic of relatively low mass and high insulating value, said body being shaped to define at least part of the inner wall of a high temperature exhaust gas passage, and an abrasion resistant ceramic coating fused onto at least the inner gas-exposed surface of said body, said coating comprising a mixture of fused silica cement and fine glass frit sintered in place on the body inner surface at a temperature below that which will damage the thin walls of the body.
Claim 2
Dependent Claim
104 words
An insulating exhaust port liner for internal combustion engines and the like, said liner comprising a formed thin wall body of rigidized fibrous ceramic of relatively low mass and high insulating value, said body being shaped to define at least part of the inner wall of a high temperature exhaust gas passage, and an abrasion resistant ceramic coating fused onto at least the inner gas-exposed surface of said body, said coating comprising a mixture of fused silica cement and fine glass frit sintered in place on the body inner surface at a temperature below that which will damage the thin walls of the body.
Claim 3
Dependent Claim
105 words
An insulating exhaust port liner for internal combustion engines and the like, said liner comprising a formed thin wall body of rigidized fibrous alumina-silica ceramic of relatively low mass and high insulating value, said body being shaped to define at least part of the inner wall of a high temperature exhaust gas passage, and an abrasion reistant ceramic coating fused onto at least the inner gas-exposed surface of said body, said coating comprising a mixture of fused silica cement and fine glass frit sintered in place on the body inner surface at a temperature below that which will damage the thin walls of the body.
Claim 4
Dependent Claim
105 words
An insulating exhaust port liner for internal combustion engines and the like, said liner comprising a formed thin wall body of rigidized fibrous alumina-silica ceramic of relatively low mass and high insulating value, said body being shaped to define at least part of the inner wall of a high temperature exhaust gas passage, and an abrasion reistant ceramic coating fused onto at least the inner gas-exposed surface of said body, said coating comprising a mixture of fused silica cement and fine glass frit sintered in place on the body inner surface at a temperature below that which will damage the thin walls of the body.
Claim 5
Dependent Claim
54 words
An exhaust port liner according to claim 2 wherein the walls of the formed alumina-silica body have a thickness on the order of 3.8 mm and the abrasion resistant silica glass coating thereon is a mixture in approximate proportions by weight of 56 parts fused silica cement and 50 parts fine glass frit powder.
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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) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |