US3142638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating solids from sewage
Assignee: Individual
•
Filing: 1962-06-29
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Granted: 1964-07-28
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Expires: 1982-06-29
Abstract
No abstract record available.
Inventors
- 👤 Blaisdell Donald Stapf
- 👤 Klaas Ruth Elizabeth Barry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:42
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; B; B01; B01D; B01D21/00; B01D21/0009; B01D21/01; B03; B03C; B03C1/00; B03C1/005; B03C1/01; C02F1/48; C02F1/488
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A PROCESS FOR SEPARATING SOLIDS FROM SEWAGE, IN WHICH THERE ARE ADMIXED WITH SAID SEWAGE IRON ORE WEIGHTING AGENT HAVING A SPECIFIC GRAVITY IN EXCESS OF 1 AND HAVING A PARTICLE SIZE SMALLER THAN 50 MESH (U.S. STANDARD SCREENS), AND WATER-DISPERSIBLE SYNTHETIC ORGANIC CATIONIC POLYELECTROLYTIC FLOCCULATING MATERIAL HAVING A MOLECULAR WEIGHT IN EXCESS OF 10,000 AND AT LEAST ONE AMINE GROUP PER 10,000 UNITS OF MOLECULAR WEIGHT, SAID WATER-DISPERSIBLE SYNTHETIC ORGANIC CATIONIC POLYELECTROLYTIC FLOCCULATING MATERIAL BEING EMPLOYED IN AN AMOUNT, FROM 1 TO 300 PARTS BY WEIGHT PER MILLION PARTS OF SEWAGE, SUFFICIENT TO CAUSE FLOCCULATION AND ACCELERATED SEDIMENTATION OF SOLIDS, AND IN WHICH, AFTER SAID FLOCCULATION AND ACCELERATED SEDIMENTATION OF SOLIDS, THERE IS SEPARATED FROM THE SEWAGE COMPOSITION FORMED AN AQUEOUS PORTION SUBSTANTIALLY FREE OF SUSPENDED SOLIDS.
Claim 2
Dependent Claim
128 words
A PROCESS FOR SEPARATING SOLIDS FROM SEWAGE, IN WHICH THERE ARE ADMIXED WITH SAID SEWAGE IRON ORE WEIGHTING AGENT HAVING A SPECIFIC GRAVITY IN EXCESS OF 1 AND HAVING A PARTICLE SIZE SMALLER THAN 50 MESH (U.S. STANDARD SCREENS), AND WATER-DISPERSIBLE SYNTHETIC ORGANIC CATIONIC POLYELECTROLYTIC FLOCCULATING MATERIAL HAVING A MOLECULAR WEIGHT IN EXCESS OF 10,000 AND AT LEAST ONE AMINE GROUP PER 10,000 UNITS OF MOLECULAR WEIGHT, SAID WATER-DISPERSIBLE SYNTHETIC ORGANIC CATIONIC POLYELECTROLYTIC FLOCCULATING MATERIAL BEING EMPLOYED IN AN AMOUNT, FROM 1 TO 300 PARTS BY WEIGHT PER MILLION PARTS OF SEWAGE, SUFFICIENT TO CAUSE FLOCCULATION AND ACCELERATED SEDIMENTATION OF SOLIDS, AND IN WHICH, AFTER SAID FLOCCULATION AND ACCELERATED SEDIMENTATION OF SOLIDS, THERE IS SEPARATED FROM THE SEWAGE COMPOSITION FORMED AN AQUEOUS PORTION SUBSTANTIALLY FREE OF SUSPENDED SOLIDS.
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) | 1967-07-28 | 1968-01-27 | 1968-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-28 | 1972-01-27 | 1972-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-28 | 1976-01-27 | 1976-07-28 | $7700.00 | Window Closed / Lapsed |