US4770778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow fiber semipermeable membrane element and a method of producing the same
Assignee: Asahi Kasei Corp
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Filing: 1987-11-12
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Granted: 1988-09-13
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Expires: 2007-11-12
Abstract
Abstract There is disclosed a hollow fiber semipermeable membrane element comprising hollow fiber semipermeable membranes having their respective one end portions or both end portions bonded together by means of a vulcanized rubber, so that the semipermeable membrane element has a high resistance to chemicals. The incorporation of a graphite fluoride in the rubber serves to further increase not only the hardness of the bonding rubber portions but also the resistance of the bonding rubber portions to chemicals. Such a semipermeable element can be easily, efficiently produced on a commercial scale.
Inventors
- 👤 Takayuki Yokoyama
- 👤 Takashi Ogawa
- 👤 Nobuatsu Watanabe
- 👤 Kazuo Toyomoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:10
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/02; B01D63/021; B01D63/022; B01D63/0223; B01D63/023; B29; B29C; B29C70/00; B29C70/68; B29C70/84; B29C70/845; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2933; Y10T428/2935; Y10T428/294; Y10T428/296; Y10T428/2964; Y10T428/2967; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
44 words
A hollow fiber semipermeable membrane element comprising a plurality of hollow fiber semipermeable membranes substantially equal in length, arranged in a lengthwise direction and bonded together by means of vulcanizing an unvulcanized rubber coated on individual hollow fiber semipermeable membranes at their end portions.
Claim 2
Dependent Claim
44 words
A hollow fiber semipermeable membrane element comprising a plurality of hollow fiber semipermeable membranes substantially equal in length, arranged in a lengthwise direction and bonded together by means of vulcanizing an unvulcanized rubber coated on individual hollow fiber semipermeable membranes at their end portions.
Claim 3
Dependent Claim
39 words
A hollow fiber semipermeable membrane element according to claim 1, wherein said vulcanized rubber contains a graphite fluoride in an amount of 1 to 100% by weight based on the weight of the rubber value of said vulcanized rubber.
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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) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |