Patent US3674429A successfully refreshed from Google Patents.
US3674429A
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Adsorption process for water and nitrogen oxides
Assignee: Union Carbide Corp
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Filing: 1971-01-06
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Granted: 1972-07-04
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Expires: 1991-01-06
Abstract
Abstract IN THE PROCESS WHEREIN NITROGEN OXIDES ARE RECOVERED FROM STACK GAS STREAMS CONTAINING WATER VAPOR BY SELECTIVE ADSORPTION USING A DUAL BED OF SILICA GEL AND MOLECULAR SIEVES, THE FORMATION OF CORROSICE AQUEOUS NITRIC ACID IN THE ADSORBENT BED DURING REGENERATION THEREOF IS PREVENTED BY THE USE OF A HEAT SINK INTERPOSED BETWEEN THE SILICA GEL AND THE MOLECULAR SIEVE. THE HEAT SINK SERVES TO PREVENT PREMATURE DESORPTION OF WATER FROM THE SILICA GEL BED AND THE CONTACT OF LIQUID WATER WITH DESORBED NO2.
Inventors
- 👤 John Joseph Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:41
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9481; B01D53/02; B01D53/04; B01D53/46; B01D53/48; B01D53/52; B01D53/523; B01D53/526; C; C01; C01B; C01B21/00; C01B21/20; C01B21/36; C10; C10G; C10G5/00; C10G5/04; C10K; C10K1/00; C10K1/08; C10K1/16; B01D2253/00; B01D2253/10; B01D2253/106; B01D2253/108; B01D2257/00; B01D2257/10; B01D2257/102; B01D2257/104; B01D2257/40; B01D2257/404; B01D2259/00; B01D2259/40; B01D2259/401; B01D2259/414; B01D2259/4141; B01D2259/4145; B01D2259/4146
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |