US3218253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage treatment process
Assignee: Villanova University
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Filing: 1962-12-04
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Granted: 1965-11-16
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Expires: 1982-12-04
Abstract
No abstract record available.
Inventors
- 👤 Edgar W Clarke
- 👤 Robert E White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:43
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/281
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
A PROCESS FOR THE TREATMENT OF SEWAGE WHICH COMPRISES: (1) INTIMATELY CONTACTING FOR A PERIOD OF APPROXIMATELY 10 MINUTES SCREENED RAW SEWAGE WITH APPROXIMATELY 50 P.P.M. OF A CONTACT MATERIAL CONSISTING ESSENTIALLY OF A CATIONIC, SURFACTANT, HYDROPHOBIC AND ORGANOPHILIC CLAY COMPOSITION OF THE KAOLINITE TYPE IS PLATELIKE CRYSTALLINE FORM HAVING A PARTICLE SIZE DISTRIBUTION WITHIN THE RANGE OF FROM ABOUT 0.2 MICRON TO ABOUT 3 MICRONS AND AN AVERAGE PARTICLE SIZE OF 0.55 MICRON, ALL IN EQUIVALENT SPHERICAL DIAMETERS, AND HAVING A REFRACTIVE INDEX OF APPROXIMATELY 1.56, A SPECIFIC GRAVITY OF APPROXIMATELY 2.58, AND A PH WITHIN THE RANGE OF FROM ABOUT 6.1 TO ABOUT 6.5; (2) ALLOWING THE CONTACTED MIXTURE OF SEWAGE AND CONTACTING MATERIAL TO SETTLE IN THE QUIESCENT STATE FOR A PERIOD OF APPROXIMATELY 10 MINUTES; AND (3) DECANTING OFF AT A POINT INTERMEDIATE THE TOP AND THE BOTTOM OF THE SETTLED MIXTURE A TREATED SEWAGE HAVING A REDUCED BIOCHEMICAL OXYGEN DEMAND AND A REDUCED CONTENT OF SUSPENDED SOLIDS.
Claim 2
Dependent Claim
162 words
A PROCESS FOR THE TREATMENT OF SEWAGE WHICH COMPRISES: (1) INTIMATELY CONTACTING FOR A PERIOD OF APPROXIMATELY 10 MINUTES SCREENED RAW SEWAGE WITH APPROXIMATELY 50 P.P.M. OF A CONTACT MATERIAL CONSISTING ESSENTIALLY OF A CATIONIC, SURFACTANT, HYDROPHOBIC AND ORGANOPHILIC CLAY COMPOSITION OF THE KAOLINITE TYPE IS PLATELIKE CRYSTALLINE FORM HAVING A PARTICLE SIZE DISTRIBUTION WITHIN THE RANGE OF FROM ABOUT 0.2 MICRON TO ABOUT 3 MICRONS AND AN AVERAGE PARTICLE SIZE OF 0.55 MICRON, ALL IN EQUIVALENT SPHERICAL DIAMETERS, AND HAVING A REFRACTIVE INDEX OF APPROXIMATELY 1.56, A SPECIFIC GRAVITY OF APPROXIMATELY 2.58, AND A PH WITHIN THE RANGE OF FROM ABOUT 6.1 TO ABOUT 6.5; (2) ALLOWING THE CONTACTED MIXTURE OF SEWAGE AND CONTACTING MATERIAL TO SETTLE IN THE QUIESCENT STATE FOR A PERIOD OF APPROXIMATELY 10 MINUTES; AND (3) DECANTING OFF AT A POINT INTERMEDIATE THE TOP AND THE BOTTOM OF THE SETTLED MIXTURE A TREATED SEWAGE HAVING A REDUCED BIOCHEMICAL OXYGEN DEMAND AND A REDUCED CONTENT 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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |