US4652376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for disposing emulsifiable oil-containing waste water
Assignee: Filton International Co
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Filing: 1985-02-15
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Granted: 1987-03-24
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Expires: 2005-02-15
Abstract
Abstract Emulsifiable oil-containing waste water is disposed by bringing said waste water into contact with a filter medium comprising a mixture of carbon and powder or granule of a porous ceramic by gravity filtration or pressure filtration, said porous ceramic being prepared by adding a void-forming material to a mixture of at least two members selected from clay, silica and aluminum hydroxide and firing the resulting mixture to form a porous ceramic mainly composed of silicon oxide and aluminum oxide.
Inventors
- 👤 Shunichi Kumaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:43
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/08; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0202; B01D17/08; B01D39/00; B01D39/02; B01D39/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
A method for disposing emulsifiable oil-containing waste water, which comprises bringing said waste water into contact with a filter medium comprising a mixture of carbon and power or granule of a porous ceramic by gravity filtration or pressure filtration, said porous ceramic consisting essentially of silicon oxide and aluminum oxide and prepared by adding at least one void-forming material to a mixture of clay and at least one member selected from the group consisting of silica and aluminum hydroxide and firing the resulting mixture.
Claim 2
Independent Claim
84 words
A method for disposing emulsifiable oil-containing waste water, which comprises bringing said waste water into contact with a filter medium comprising a mixture of carbon and power or granule of a porous ceramic by gravity filtration or pressure filtration, said porous ceramic consisting essentially of silicon oxide and aluminum oxide and prepared by adding at least one void-forming material to a mixture of clay and at least one member selected from the group consisting of silica and aluminum hydroxide and firing the resulting mixture.
Claim 3
Dependent Claim
28 words
A method for disposing emulsifiable oil-containing waste water as set forth in claim 1, wherein the filter medium contains about 90 to about 30% by weight of carbon.
Claim 4
Dependent Claim
35 words
A method for disposing emulsifiable oil-containing waste water as set forth in claim 1, wherein the filter medium is composed of about 60% by weight of the ceramic and about 40% by weight of carbon.
Claim 5
Dependent Claim
23 words
A method for disposing emulsifiable oil-containing waste water as set forth in claim 1, wherein activated carbon powder is used as the carbon.
Claim 6
Dependent Claim
32 words
A method for disposing emulsifiable oil-containing waste water, as set forth in claim 1, wherein the porous ceramic contains 45-80% by weight of silicon oxide and 15-40% by weight of aluminum oxide.
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) | 1990-03-23 | 1990-09-22 | 1991-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-23 | 1994-09-22 | 1995-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-23 | 1998-09-22 | 1999-03-24 | $7700.00 | Window Closed / Lapsed |