US4976760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous ceramic article for use as a filter for removing particulates from diesel exhaust gases
Assignee: Cercona Inc
•
Filing: 1989-09-08
•
Granted: 1990-12-11
•
Expires: 2009-09-08
Abstract
Abstract A filtering element for use in trapping particulates from a diesel exhaust gas, made up of a porous refractory ceramic body of predominant open-cell porosity prepared by firing an aluminosilicate hydrogel-bonded porous ceramic composition, and preferably further containing on the filter inlet and/or outlet surface thereof an integral thin porous ceramic membrane layer having pores whose average diameter is less than that of the pores in the body and at the other surfaces.
Inventors
- 👤 Richard L. Helferich
- 👤 Robert C. Schenck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:42
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/022; F01N3/0222; B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2072; B01D39/2075; C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B38/00; C04B38/0051; C04B38/0058; C04B2111/00; C04B2111/00474; C04B2111/00793; F01N2330/00; F01N2330/06; F02; F02B; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
An element for filtering solid particulates from a diesel exhaust gas, comprising a shaped porous refractory ceramic body having a predominantly open pore structure and having distinct inlet and outlet surfaces, and where one of said surfaces contains an integral thin porous ceramic membrane layer of open cell porosity, the pores of which have an average diameter smaller than that of the pores at the other surface and the pores throughout the interior of the body, and wherein said porous refractory ceramic body is comprised of a fired porous aluminosilicate hydrogel-bonded ceramic composition.
Claim 2
Dependent Claim
93 words
An element for filtering solid particulates from a diesel exhaust gas, comprising a shaped porous refractory ceramic body having a predominantly open pore structure and having distinct inlet and outlet surfaces, and where one of said surfaces contains an integral thin porous ceramic membrane layer of open cell porosity, the pores of which have an average diameter smaller than that of the pores at the other surface and the pores throughout the interior of the body, and wherein said porous refractory ceramic body is comprised of a fired porous aluminosilicate hydrogel-bonded ceramic composition.
References Cited (Backward Citations)
US3502596A
Cited
US4451441A
Cited
US4436538A
Cited
US4456457A
Cited
JPS57184410A
Cited
JPS57184422A
Cited
US4390355A
Cited
US4652286A
Cited
JPS58159828A
Cited
US4746341A
Cited
US4732593A
Cited
US4629483A
Cited
JPS62234519A
Cited
US4759918A
Cited
US4812424A
Cited
US4846906A
Cited
US4871495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-10 | 1994-06-11 | 1994-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-10 | 1998-06-11 | 1998-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-10 | 2002-06-11 | 2002-12-11 | $7700.00 | Window Closed / Lapsed |