US3871850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter element
Assignee: Ethyl Corp
•
Filing: 1973-03-20
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Granted: 1975-03-18
•
Expires: 1993-03-20
Abstract
Abstract A filter element adapted to remove fine particulates from the exhaust gas of internal combustion engines comprising a non-woven fiber mat bonded to a wire mesh. The preferred fiber mat is an aromatic polyamide mat such as poly(m-phenyleneisophthalamide) fiber mats.
Inventors
- 👤 Denis L Lenane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:10
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/022; F01N3/0226; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D46/00; F01N2330/00; F01N2330/10; F01N2330/101; F01N2370/00; F01N2370/22; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
AN EXHAUST SYSTEM FOR AN INTERNAL COMBUSTION ENGINE INCLUDING AN EXHAUST GAS FILTER, SAID FILTER COMPRISING A FILTER HOUSING HAVING AN INLET AND AN OUTLET, SAID INLET BEING OPERATIVELY CONNECTED TO RECEIVE THE EXHAUST GAS FROM SAID INTERNAL COMBUSTION ENGINE, SAID FILTER HOUSING CONTAINING A FILTER ELEMENT DISPOSED ACROSS SAID HOUSING SUCH THAT SUBSTANTIALLY ALL OF THE EXHAUST GAS PASSES THROUGH SAID FILTER ELEMENT IN PASSING
Claim 2
Dependent Claim
66 words
AN EXHAUST SYSTEM FOR AN INTERNAL COMBUSTION ENGINE INCLUDING AN EXHAUST GAS FILTER, SAID FILTER COMPRISING A FILTER HOUSING HAVING AN INLET AND AN OUTLET, SAID INLET BEING OPERATIVELY CONNECTED TO RECEIVE THE EXHAUST GAS FROM SAID INTERNAL COMBUSTION ENGINE, SAID FILTER HOUSING CONTAINING A FILTER ELEMENT DISPOSED ACROSS SAID HOUSING SUCH THAT SUBSTANTIALLY ALL OF THE EXHAUST GAS PASSES THROUGH SAID FILTER ELEMENT IN PASSING
References Cited (Backward Citations)
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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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |