US3828525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waste gas purification
Assignee: STWB Inc
•
Filing: 1973-04-16
•
Granted: 1974-08-13
•
Expires: 1993-04-16
Abstract
Abstract Contaminants and odors are removed from the waste gases emanating from wet air oxidation reactors by passing the gases through an aqueous suspension of activated sewage sludge or the mixed liquor obtained by suspending activated sewage sludge in fresh sewage.
Inventors
- 👤 W Copa
- 👤 L Pradt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:13
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; C; C02; C02F; C02F3/00; C02F3/02; C02F3/025; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/916
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
A process according to claim 1 in which the scrubber contains activated sludge having a total solids content of between 5,000 and 10,000 mg/l.
Claim 2
Dependent Claim
34 words
A process according to claim 1 in which the scrubber contains mixed liquor obtained by adding activated sludge to fresh sewage, said liquor containing suspended solids in concentration between about 2,000 and 4,000 mg/l.
References Cited (Backward Citations)
US3359200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |