US4340403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic honeycomb filter
Assignee: NGK Insulators Ltd
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Filing: 1980-10-15
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Granted: 1982-07-20
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Expires: 2000-10-15
Abstract
Abstract The disclosed ceramic honeycomb filter comprises a ceramic honeycomb structural body with a multiplicity of parallel channels extending therethrough, selected channels being sealed at one ends thereof by sealing material while the remainder of the channels being sealed at opposite ends thereof by said sealing material in such a manner that, as dust-containing gas flows therethrough from said one ends to said opposite ends, the gas passes through walls between adjacent channels where the dust particles are collected. Said sealing material is alumina cement containing not more than 27% by weight of calcium oxide (CaO), or a mixture of the alumina cement and aggregates.
Inventors
- 👤 Noboru Higuchi
- 👤 Teruo Yano
- 👤 Masahiro Ohnishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:04
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2825; F01N3/2828; B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/31; B01D29/50; B01D29/52; B01D46/00; B01D46/24; B01D46/2403; B01D46/2407; B01D2201/00; B01D2201/46; F01N2330/00; F01N2330/06; Y; Y10; Y10S; Y10S55/00; Y10S55/30; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24157
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
42 words
A ceramic honeycomb filter having ceramic honeycomb structural body with channels whose ends are selectively sealed by sealing material comprising alumina cement containing calcium oxide (CaO), wherein said alumina cement contains not more than 27% by weight of said calcium oxide (CaO).
Claim 2
Dependent Claim
42 words
A ceramic honeycomb filter having ceramic honeycomb structural body with channels whose ends are selectively sealed by sealing material comprising alumina cement containing calcium oxide (CaO), wherein said alumina cement contains not more than 27% by weight of said calcium oxide (CaO).
Claim 3
Dependent Claim
23 words
A ceramic honeycomb filter as set forth in claim 1, wherein said sealing material comprises a mixture of said alumina cement and aggregates.
Claim 4
Dependent Claim
37 words
A ceramic honeycomb filter as set forth in one of claims 1 or 2 wherein said ceramic honeycomb structural body is made of material selected from the group consisting of cordierite ceramic material and mullite ceramic material.
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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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |