US4591440A
Expired / Lapsed
US
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Membranes for liquid separations
Assignee: Toray Industries Inc
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Filing: 1984-10-01
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Granted: 1986-05-27
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Expires: 2004-10-01
Abstract
Abstract Provided is a membrane for liquid separation which comprises mainly poly(substituted acetylene) having a repeating unit represented by the following formula: ##STR1## wherein R 1 represents a hydrogen atom or a methyl group, and R 2 represents an alkyl group having from 1 to 3 carbon atoms.
Inventors
- 👤 Toshinobu Higashimura
- 👤 Toshio Masuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:20
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/36; B01D61/362; B01D61/3621; C; C08; C08F; C08F138/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
57 words
A method for separating a liquid mixture comprising separating a liquid mixture across a membrane, said membrane comprising poly(substituted acetylene) having the formula: ##STR4## where R 1 is a hydrogen atom or a methyl group and R 2 is an alkyl group having from one to three carbon atoms, whereby said liquid mixture is separated by pervaporization.
Claim 2
Independent Claim
57 words
A method for separating a liquid mixture comprising separating a liquid mixture across a membrane, said membrane comprising poly(substituted acetylene) having the formula: ##STR4## where R 1 is a hydrogen atom or a methyl group and R 2 is an alkyl group having from one to three carbon atoms, whereby said liquid mixture is separated by pervaporization.
Claim 3
Dependent Claim
16 words
A method according to claim 1 wherein R 1 and R 2 are both methyl groups.
Claim 4
Dependent Claim
20 words
A method according to claim 1, wherein said liquid mixture is a mixture of a water-soluble organic substance and water.
Claim 5
Dependent Claim
15 words
A method according to claim 3, wherein said water-soluble organic substance is a water-soluble alcohol.
Claim 6
Dependent Claim
15 words
A method according to claim 3, wherein said water-soluble organic substance is a water-soluble ether.
Claim 7
Dependent Claim
18 words
A method according to claim 4, wherein said water-soluble alcohol is one selected from methanol, ethanol and propanol.
Claim 8
Dependent Claim
12 words
A method according to claim 5, wherein said water-soluble ether is dioxane.
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) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |