Patent US3231490A successfully refreshed from Google Patents.
US3231490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary treatment of waste water
Assignee: Dow Chemical Co
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Filing: 1963-09-16
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Granted: 1966-01-25
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Expires: 1983-09-16
Abstract
No abstract record available.
Inventors
- 👤 Fry Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:47
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/10; C02F3/103; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
IN A METHOD OF TREATING WASTE WATER COMPRISING CONTACTING THE WASTE WATER TO BE TREATED WITH AIR, THE IMPROVEMENT WHICH COMPRISES PROVIDING A FLOW OF THE WATER TO BE TREATED INTO A BED CONTAINING A GAS-LIQUID CONTACT MEDIUM, THE MEDIUM COMPRISING A PLURALITY OF SUPPORT MEMBERS, EACH SUPPORT MEMBER CARRYING AT LEAST ONE HANGING, SUBSTANTIALLY IMPEFORATE, GENERALLY FLAT, NONRIGID PLASTIC SHEET CAUSING SAID WATER TO FLOW IN A VERTICALLY DISPOSED PLANAR PATTERN OVER THE PLASTIC SHEETS, PROVIDING SAID SHEETS WITH A BACTERIA RECEPTIVE SURFACE UPON WHICH BACTERIA MAY GROW, PROVIDING A SUBSTANTIALLY UNIFORM BACTERIAL GROWTH ON SAID BACTERIA RECEPTIVE SURFACE OF SAID SHEETS, AND PROVIDING ONLY SUFFICIENT WASTE WATER THAT UNDESIRED ORGANIC MATERIALS ARE SUBSTANTIALLY REMOVED THEREFROM BY THE ACTION OF THE BACTERIA ON THE ORGANIC MATERIALS IN THE WASTE WATER.
Claim 2
Dependent Claim
131 words
IN A METHOD OF TREATING WASTE WATER COMPRISING CONTACTING THE WASTE WATER TO BE TREATED WITH AIR, THE IMPROVEMENT WHICH COMPRISES PROVIDING A FLOW OF THE WATER TO BE TREATED INTO A BED CONTAINING A GAS-LIQUID CONTACT MEDIUM, THE MEDIUM COMPRISING A PLURALITY OF SUPPORT MEMBERS, EACH SUPPORT MEMBER CARRYING AT LEAST ONE HANGING, SUBSTANTIALLY IMPEFORATE, GENERALLY FLAT, NONRIGID PLASTIC SHEET CAUSING SAID WATER TO FLOW IN A VERTICALLY DISPOSED PLANAR PATTERN OVER THE PLASTIC SHEETS, PROVIDING SAID SHEETS WITH A BACTERIA RECEPTIVE SURFACE UPON WHICH BACTERIA MAY GROW, PROVIDING A SUBSTANTIALLY UNIFORM BACTERIAL GROWTH ON SAID BACTERIA RECEPTIVE SURFACE OF SAID SHEETS, AND PROVIDING ONLY SUFFICIENT WASTE WATER THAT UNDESIRED ORGANIC MATERIALS ARE SUBSTANTIALLY REMOVED THEREFROM BY THE ACTION OF THE BACTERIA ON THE ORGANIC MATERIALS IN THE WASTE WATER.
References Cited (Backward Citations)
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US278986A
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US2197970A
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US2793017A
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US2858119A
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US2977103A
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US3113102A
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US3112261A
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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) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |