US3801696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for removing nitrogen oxides from engine exhaust
Assignee: Individual
•
Filing: 1971-11-18
•
Granted: 1974-04-02
•
Expires: 1991-11-18
Abstract
Abstract A METHOD AND APPARATUS FOR REMOVING NITROGEN OXIDES FROM COMBUSTION ENGINE EXHAUST WHEREIN THE EXHAUST IS CONDUCTED THROUGH A UREA CONTAINING LIQUID WHICH RESULTS IN THE CHEMICAL TRANSFORMATION OF THE OXIDES OF NITROGEN INTO NITROGEN, CARBON DIOXIDE AND WATER.
Inventors
- 👤 J Mark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:22
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/46; B01D53/54; B01D53/56; B01D53/9413; B01D2251/00; B01D2251/20; B01D2251/206; B01D2251/2067; B01D2255/00; B01D2255/20; B01D2255/207; B01D2255/20761
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |