US2938867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purification of sewage and industrial effluents by upflow clarification
Assignee: Individual
•
Filing: 1956-02-09
•
Granted: 1960-05-31
•
Expires: 1976-02-09
Abstract
No abstract record available.
Inventors
- 👤 Denis L Griffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:12
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5281; C02F1/5236
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
THE PROCESS OF PURIFYING LIQUID SEWAGE AND INDUSTRIAL EFFLUENTS IN LIQUID FORM WHICH COMPRISES ESTABLISHING IN A SEDIMENTATION TANK A LIQUID-PERMEABLE BLANKET OF A COHERENT MASS PREPARED FROM AT LEAST ONE COAGULATING AGENT BEFORE THE MASS IS EXPOSED TO RAW UNPURIFIED LIQUID IN MOVEMENT, INTRODUCING RAW LIQUID TO THE BOTTOM OF THE TANK, CAUSING THE RAW LIQUID TO FLOW UPWARDLY IN THE TANK WITHOUT DISPERSING THE BLANKET, WITHDRAWING PURIFIED LIQUID FROM THE TANK ABOVE THE BLANKET AND WITHDRAWING SLUDGE FROM THE TANK BELOW THE BLANKET.
Claim 2
Dependent Claim
85 words
THE PROCESS OF PURIFYING LIQUID SEWAGE AND INDUSTRIAL EFFLUENTS IN LIQUID FORM WHICH COMPRISES ESTABLISHING IN A SEDIMENTATION TANK A LIQUID-PERMEABLE BLANKET OF A COHERENT MASS PREPARED FROM AT LEAST ONE COAGULATING AGENT BEFORE THE MASS IS EXPOSED TO RAW UNPURIFIED LIQUID IN MOVEMENT, INTRODUCING RAW LIQUID TO THE BOTTOM OF THE TANK, CAUSING THE RAW LIQUID TO FLOW UPWARDLY IN THE TANK WITHOUT DISPERSING THE BLANKET, WITHDRAWING PURIFIED LIQUID FROM THE TANK ABOVE THE BLANKET AND WITHDRAWING SLUDGE FROM THE TANK BELOW THE BLANKET.
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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) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |