US4501785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilized membrane of porous hydrophobic material and process of producing same
Assignee: Senko Medical Instrument Manufacturing Co Ltd
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Filing: 1983-07-22
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Granted: 1985-02-26
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Expires: 2003-07-22
Abstract
Abstract A hydrophilized membrane of a porous hydrophobic material having micropores each defined by a surface at least part of which is coated with polyethylene glycol. Water is allowed to pass through the micropores. There is also disclosed a process for hydrophilizing such a porous hydrophobic membrane.
Inventors
- 👤 Hikaru Nakanishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:53
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T428/249993
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
30 words
A hydrophilized, microporous membrane consisting of a hydrophobic material, said membrane having micropores therethrough, and said membrane having at least a portion of the surfaces thereof coated with polyethylene glycol.
Claim 2
Dependent Claim
30 words
A hydrophilized, microporous membrane consisting of a hydrophobic material, said membrane having micropores therethrough, and said membrane having at least a portion of the surfaces thereof coated with polyethylene glycol.
Claim 3
Dependent Claim
20 words
The membrane of claim 1, wherein the entire surface of each micropore of said membrane is coated with polyethylene glycol.
Claim 4
Dependent Claim
16 words
The membrane of claim 1, wherein said hydrophobic material is a polyolefin or a substituted polyolefin.
Claim 5
Dependent Claim
19 words
The membrane of claim 1, wherein the pore size of said micropores ranges from 0.4 μm to 2 μm.
Claim 6
Dependent Claim
89 words
A hydrophilized, microporous membrane of a hydrophobic material prepared by a process, comprising: (a) preparing a porous membrane from a polymer material consisting of a hydrophobic polymer; (b) pretreating the pores of said membrane with an organic solvent or aqueous solution thereof which has an affinity for the hydrophobic membrane; (c) treating the pores of the pretreated membrane with polyethylene glycol or an aqueous solution of polyethylene glycol, thereby preparing a membrane, the surfaces of the pores which permeate said membrane being at least partially coated with polyethylene glycol.
Claim 7
Dependent Claim
89 words
A hydrophilized, microporous membrane of a hydrophobic material prepared by a process, comprising: (a) preparing a porous membrane from a polymer material consisting of a hydrophobic polymer; (b) pretreating the pores of said membrane with an organic solvent or aqueous solution thereof which has an affinity for the hydrophobic membrane; (c) treating the pores of the pretreated membrane with polyethylene glycol or an aqueous solution of polyethylene glycol, thereby preparing a membrane, the surfaces of the pores which permeate said membrane being at least partially coated with polyethylene glycol.
Claim 8
Dependent Claim
23 words
The membrane of claim 5, wherein the liquid of the pretreatment step of claim 5 is an organic solvent solution of polyethylene glycol.
Claim 9
Dependent Claim
26 words
The membrane of claim 6, wherein the ratio of organic solvent to polyethylene glycol in said pretreatment liquid is in the range of 19/1 to 1/19.
Claim 10
Dependent Claim
49 words
The membrane of claim 5, wherein said organic solvent which has an affinity for said hydrophobic membrane is selected from the group consisting of methyl alcohol, ethyl alcohol, isopropyl alcohol, ethylene glycol, an aromatic hydrocarbon, chloroform, acetone, carbon tetrachloride or a mixture of two or more of these solvents.
Claim 11
Dependent Claim
86 words
A hydrophilized, microporous membrane of a hydrophobic material prepared by a process, consisting essentially of: (a) preparing a porous membrane from a hydrophobic polymer; (b) pretreating the pores of said membrane with an organic solvent or aqueous solution thereof which has an affinity for the hydrophobic membrane; (c) treating the pores of the pretreated membrane with polyethylene glycol or an aqueous solution of polyethylene glycol, thereby preparing a membrane, the surfaces of the pores which permeate said membrane being at least partially coated with polyethylene glycol.
Claim 12
Dependent Claim
86 words
A hydrophilized, microporous membrane of a hydrophobic material prepared by a process, consisting essentially of: (a) preparing a porous membrane from a hydrophobic polymer; (b) pretreating the pores of said membrane with an organic solvent or aqueous solution thereof which has an affinity for the hydrophobic membrane; (c) treating the pores of the pretreated membrane with polyethylene glycol or an aqueous solution of polyethylene glycol, thereby preparing a membrane, the surfaces of the pores which permeate said membrane being at least partially coated with polyethylene glycol.
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) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |