Patent US5013501A successfully refreshed from Google Patents.
US5013501A
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US
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Method of proudcing ceramic manifolds for thermally insulating exhaust channels
Assignee: NGK Insulators Ltd
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Filing: 1989-12-21
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Granted: 1991-05-07
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Expires: 2009-12-21
Abstract
Abstract In a method for effectively producing ceramic manifolds for thermally insulating exhaust channels, an intermediate product is first formed by drain casting which includes a main ceramic pipe having a plurality of branch pipes extending therefrom whose ends are connected together by elongated connection members in the form of thin plates or bars. Thereafter, the intermediate product is fired and the ends of the branch pipes are then cut off together with the connection members. In this manner, even ceramic pipes complicated in shape readily can be produced by preventing strains and deformations which would otherwise occur during firing of the intermediate product.
Inventors
- 👤 Kaname Fukao
- 👤 Toshiyuki Hamanaka
- 👤 Takashi Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:40
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/16; B; B28; B28B; B28B11/00; B28B11/12; F01N13/08; F01N13/10; F01N13/102; F01N13/18; F02; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
82 words
A method of producing a ceramic manifold for thermally insulating exhaust channels, comprising the steps of forming by drain casting an intermediate product including a main ceramic pipe having a plurality of branch pipes extending therefrom whose ends are integrally connected together by at least one elongated connection member to maintain a constant spacing between the branch pipes during firing, firing the intermediate product, and cutting off the ends of the branch pipes together with the at least one elongated connection member.
Claim 2
Independent Claim
82 words
A method of producing a ceramic manifold for thermally insulating exhaust channels, comprising the steps of forming by drain casting an intermediate product including a main ceramic pipe having a plurality of branch pipes extending therefrom whose ends are integrally connected together by at least one elongated connection member to maintain a constant spacing between the branch pipes during firing, firing the intermediate product, and cutting off the ends of the branch pipes together with the at least one elongated connection member.
Claim 3
Dependent Claim
17 words
A method as set forth in claim 1, wherein said elongated connection member is a thin plate.
Claim 4
Dependent Claim
16 words
A method as set forth in claim 1, wherein said elongated connection member is a bar.
Claim 5
Dependent Claim
30 words
A method as set forth in claim 1, wherein said connection member has a thickness on the order of 5 mm and a width on the order of 5-10 mm.
Claim 6
Dependent Claim
15 words
A method as set forth in claim 1, wherein said ceramic manifold comprises aluminum titanate.
Claim 7
Dependent Claim
41 words
A method as set forth in claim 1, wherein in forming the intermediate product by drain casting, at least one opening of the product is formed integrally with a closure for the opening, and the closure is cut away after firing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |