Patent US3551641A successfully refreshed from Google Patents.
US2528403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Septic tank treatment of sewage
Assignee: Individual
•
Filing: 1949-07-15
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Granted: 1950-10-31
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Expires: 1969-07-15
Abstract
No abstract record available.
Inventors
- 👤 Max H West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:29
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
THE METHOD OF TREATMENT OF DOMESTIC SEWAGE SOLIDS IN AN ANAEROBIC DIGESTION TANK WHICH INCLUDES THE STEP OF INTRODUCING A SMALL AMOUNT OF A FINELY DIVIDED MIXTURE COMPRISING SAWDUST AS A FLOATING AGENT, YEAST AND A NUTRIENT FLOUR FOR THE ANEROBIC BACTERIA, WHEREBY THE SAWDUST WILL CARRY THE YEAST AND NUTRIENT FLOUR TO THE TOP OF THE TANK.
Claim 2
Independent Claim
58 words
THE METHOD OF TREATMENT OF DOMESTIC SEWAGE SOLIDS IN AN ANAEROBIC DIGESTION TANK WHICH INCLUDES THE STEP OF INTRODUCING A SMALL AMOUNT OF A FINELY DIVIDED MIXTURE COMPRISING SAWDUST AS A FLOATING AGENT, YEAST AND A NUTRIENT FLOUR FOR THE ANEROBIC BACTERIA, WHEREBY THE SAWDUST WILL CARRY THE YEAST AND NUTRIENT FLOUR TO THE TOP OF THE TANK.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |