Patent US3824186A successfully refreshed from Google Patents.
US3824186A
Expired / Lapsed
US
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Biotreatment process
Assignee: STWB Inc
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Filing: 1972-01-24
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Granted: 1974-07-16
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Expires: 1992-01-24
Abstract
Abstract THE LIQUORS OBTAINED BY DEWATERING THERMALLY CONDITIONED ORGANIC SLUDGE ARE SUBJECTED TO SEPARATE BIOTREATMENT IN UNDILUTED FORM, THEREBY REMOVING MORE THAN 90% OF THE BIOLOGICAL OXYGEN DEMAND FROM THE LIQUORS. THE BIOTREATMENT IS CARRIED OUT IN AN AERATION VESSEL CONTAINING BIOLOGICAL SLUDGE.
Inventors
- 👤 A Erickson
- 👤 E Pogainis
- 👤 G Teletzke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:07
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |