US4215096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of acidic contaminants from gas streams by caustic impregnated activated carbon
Assignee: Calgon Carbon Corp
•
Filing: 1978-11-09
•
Granted: 1980-07-29
•
Expires: 1998-11-09
Abstract
Abstract Gas streams contaminated with acid and acid precursor gases and vapors are purified by contacting the gas streams with activated carbon impregnated with sodium hydroxide.
Inventors
- 👤 Rabindra K. Sinha
- 👤 Charles K. Polinsky
- 👤 S. David Cifrulak
- 👤 Norman J. Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:10
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/52; B01D53/526
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
42 words
A process for the removal of chlorine from gas streams which comprises contacting the gas stream with activated carbon impregnated with about 0.5 to about 20 percent by weight sodium hydroxide and about 4 to about 50 percent by weight of moisture.
Claim 2
Dependent Claim
42 words
A process for the removal of chlorine from gas streams which comprises contacting the gas stream with activated carbon impregnated with about 0.5 to about 20 percent by weight sodium hydroxide and about 4 to about 50 percent by weight of moisture.
Claim 3
Dependent Claim
24 words
A process as in claim 1 wherein the gas stream is first contacted with an activated carbon that is not impregnated with sodium hydroxide.
References Cited (Backward Citations)
US1781664A
Cited
US1843355A
Cited
US2196246A
Cited
US2537448A
Cited
US4072479A
Cited
US4113839A
Cited
US4072480A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-29 | 1984-01-28 | 1984-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-29 | 1988-01-28 | 1988-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-29 | 1992-01-28 | 1992-07-29 | $7700.00 | Window Closed / Lapsed |