US3556716A
Expired / Lapsed
US
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Removal of h2s and nh3 from gas streams
Assignee: Rohm and Haas Co
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Filing: 1967-04-05
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Granted: 1971-01-19
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Expires: 1987-04-05
Abstract
Abstract NATURAL GASES, PARTICULARLY THOSE RESULTING FROM PETROLEUM REFINING OPERATIONS, FREQUENTLY CONTAIN UNDESIRABLY EXCESSIVE QUANTITIES OF H2S AND NH3. THE H2S GAS IS REMOVED BY TREATMENT WITH SUBSTANTIALLY ANHYDROUS MACRORETICULAR OR MACROPOROUS ION EXCHANGE RESINS HAVING A PRESCRIBED MINIMUM SURFACE AREA AND ION EXCHANGE FUNCTIONALLY. THE NH3 IS REMOVED BY TREATMENT WITH CARBOXYLIC TYPE CATION EXCHANGE RESINS.
Inventors
- 👤 Frank X Pollio
- 👤 Kenneth A Kun
- 👤 Robert Kunin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:47
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; B; B01; B01D; B01D53/00; B01D53/02; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/20; B01J41/00; B01J41/08; B01J41/12; B01J41/14; B01J47/00; B01J47/02; B01J47/026; B01D2253/00; B01D2253/20; B01D2253/202; B01D2257/00; B01D2257/30; B01D2257/304; B01D2257/40; B01D2257/406; Y; Y02; Y02P; Y02P20/00; Y02P20/151
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |