US4270936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coiled fibrous metallic material and coating for diesel exhaust particulate trap
Assignee: Motors Liquidation Co
•
Filing: 1980-01-18
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Granted: 1981-06-02
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Expires: 2000-01-18
Abstract
Abstract A fibrous filter element for trapping diesel engine exhaust particulates comprises a mass of coiled wire of flattened cross section compacted into a small passage gas pervious body. The base wire is made of high temperature resistant metal, preferably an iron chromium aluminum alloy. The wire is coated with a particulate collection-enhancing coating of titanate ceramic.
Inventors
- 👤 Gamdur S. Mann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:04
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2027; B01D39/2041; B01D46/00; B01D46/30; F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/022; F01N3/0226; F01N3/023; F01N3/027; B01D2239/00; B01D2239/04; B01D2239/0457; B01D2239/0471; B01D2239/0492; F01N2330/00; F01N2370/00; F01N2370/22; F01N2430/00; F01N2430/06; F02; F02B; F02B3/00; F02B3/06; Y; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
Claim 2
Dependent Claim
69 words
A fibrous filter element for a diesel engine exhaust particulate trap or the like, said element comprising a mass of coiled wire coil of flattened cross section compacted into a small passage gas pervious body, said wire being formed of a metallic material and coated with a titanate ceramic, said wire and coating being capable of withstanding temperatures of up to 1800 degrees F. without damage to the element.
Claim 3
Dependent Claim
27 words
The combination of claim 1 wherein said wire is formed of an iron based alloy containing a minimum of about 11.5 percent chromium and 4 percent aluminum.
Claim 4
Dependent Claim
26 words
The combination of claim 2 wherein said alloy further contains amounts of from 0.02 to 0.25 percent of an oxidation and sulfidation improving rare earth material.
Claim 5
Dependent Claim
21 words
The combination of claim 3 wherein said rare earth material is selected from the group consisting of yttrium, lanthanum and hafnium.
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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) | 1984-06-01 | 1984-12-01 | 1985-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-01 | 1988-12-01 | 1989-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-01 | 1992-12-01 | 1993-06-02 | $7700.00 | Window Closed / Lapsed |