US3816595A
Expired / Lapsed
US
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Method and apparatus for removing nitrogen oxides from a gas stream
Assignee: Aqua Chem Inc
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Filing: 1971-11-15
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Granted: 1974-06-11
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Expires: 1991-11-15
Abstract
Abstract NITROGEN OXIDES ARE SEPARATED FROM A HOT GAS MIXTURE BY PLACING THE MIXTURE IN CONTACT WITH A SILICON COMPOUND SUCH AS SILICON CARBIDE.
Inventors
- 👤 Haye P La
- 👤 G Craig
- 👤 J Turecek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:04
CPC Classifications
F; F23; F23C; F23C13/00; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/54; B01D53/56; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8631; F23B; F23B5/00; F23C6/00; F23C6/04; F23J; F23J15/00; F24; F24H; F24H9/00; F24H9/18; F24H9/1809; F24H9/1832; F24H9/1845; F23B2700/00; F23B2700/018; F24H1/00; F24H1/0027; F24H1/0045; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
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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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |