US4358380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reproducing water-soluble cutting agents
Assignee: Maruchi Kohken Co Ltd
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Filing: 1981-03-25
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Granted: 1982-11-09
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Expires: 2001-03-25
Abstract
Abstract A method of recycling and purifying water-soluble cutting agents is disclosed. The used water-soluble cutting agent is recycled by filtering through an oil-water separating filter consisting of a porous sheet and an oil-water separating layer composed essentially of a water-insoluble and water absorbable gel layer, which is formed on a surface portion of the porous sheet and is adapted to be contacted with the cutting agent and/or surface portions of the porous sheet serving as flow path.
Inventors
- 👤 Masami Hasegawa
- 👤 Utaro Sakai
- 👤 Takahisa Naitoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:52
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/04; B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/045; B01D17/08; B01D17/10; B01D39/00; B01D39/14; Y; Y02; Y02P; Y02P70/00; Y02P70/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
97 words
A method of recycling and purifying an aqueous solution of a water-soluble cutting agent, comprising the step of filtering a used solution of water-soluble cutting agent containing water, a water-soluble cutting agent and an oil contaminant through an oil-water separating filter, said oil-water separating filter comprising a porous sheet having thereon an oil-water separating layer, said layer consisting essentially of a water-insoluble and water-absorbing gel layer having both an oil-resistant and oil-repellent function and a water-permeable and water-absorbing function, said layer being formed on the portion of said porous sheet which is contacted by said cutting agent.
Claim 2
Independent Claim
97 words
A method of recycling and purifying an aqueous solution of a water-soluble cutting agent, comprising the step of filtering a used solution of water-soluble cutting agent containing water, a water-soluble cutting agent and an oil contaminant through an oil-water separating filter, said oil-water separating filter comprising a porous sheet having thereon an oil-water separating layer, said layer consisting essentially of a water-insoluble and water-absorbing gel layer having both an oil-resistant and oil-repellent function and a water-permeable and water-absorbing function, said layer being formed on the portion of said porous sheet which is contacted by said cutting agent.
Claim 3
Dependent Claim
15 words
A method as claimed in claim 1, wherein said gel layer comprises a polymeric material.
Claim 4
Dependent Claim
16 words
A method as claimed in claim 2, wherein said gel layer has been formed by polycondensation.
Claim 5
Dependent Claim
29 words
A method as claimed in claim 1, wherein said porous sheet comprises a plurality of strands, and said gel layer comprises a coating on said strands throughout said filter.
Claim 6
Dependent Claim
28 words
A method as claimed in claim 4, wherein said filter has a basis weight of 100-200 g/m 2 and a water permeability of 50-150 seconds/50 cc/cm 2 .
Claim 7
Dependent Claim
29 words
A method as claimed in claim 1, wherein said gel layer contains an oil repellant agent, an oil collecting agent, and a surface tension depressant or oil gathering agent.
Claim 8
Dependent Claim
32 words
A method as claimed in claim 1, wherein tiny oil droplets in said solution are caught by said filter and coalesce to form larger oil droplets, which then secede from said filter.
Claim 9
Dependent Claim
23 words
A method as claimed in claim 1, wherein said porous sheet is selected from cellulosic pulps, polyolefinic synthetic pulps and a mixture thereof.
Claim 10
Dependent Claim
28 words
A method as claimed in claim 1, wherein said filter has a basis weight of 80-450 g/m 2 and a water permeability of 10-320 seconds/50 cc/cm 2 .
References Cited (Backward Citations)
GB628464A
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GB657715A
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US3494863A
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FR2152670B3
Cited
FR2218125A1
Cited
GB1501554A
Cited
GB1500941A
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FR2286851B1
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FR2286850B1
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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) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |