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US3736726A
Expired / Lapsed
US
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Process for the removal of dimethyl sulfate from gases by adsorption on active charcoal
Assignee: Hoechst AG
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Filing: 1971-12-20
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Granted: 1973-06-05
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Expires: 1991-12-20
Abstract
Abstract Dimethyl sulfate is removed from gases, e.g., from indoor or exhaust air. The gases are conducted through active charcoal to absorb the dimethyl sulfate. The active charcoal is regenerated with a base, then washed with water and re-used for the absorption of dimethyl sulfate without any intermediate drying.
Inventors
- 👤 R Grimm
- 👤 W Herzog
- 👤 R Lademann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:49
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; Y; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3455089A
Cited
US3596438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |