US4670341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow fiber
Assignee: WR Grace and Co Conn
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Filing: 1985-05-17
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Granted: 1987-06-02
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Expires: 2005-05-17
Abstract
Abstract A hollow fiber suitable for ultrafiltration formed from a microporous polyolefinic composition comprising from 8 to 93 volume percent polyolefin, from 7 to 92 volume percent of filler and from 0 to 10 volume percent of a plasticizer for the polyolefin to provide hollow fiber walls having pores at least 70 percent of which have a diameter of 0.3 micron or less.
Inventors
- 👤 Christian B. Lundsager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:03
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; B; B01; B01D; B01D67/00; B01D67/0002; B01D67/0023; B01D67/003; B01D69/00; B01D69/08; B01D71/00; B01D71/06; B01D71/26; D01D; D01D5/00; D01D5/24; B01D2323/00; B01D2323/12; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
117 words
A hollow fiber suitable for ultrafiltration comprising a hollow tube structure having an average wall thickness of from 1 to 20 mils and an average inner diameter of said tube of from about 5 to about 500 mils, the tube wall being formed of a substantially uniform mixture of from 8 to 93 volume percent polyolefin having a weight average molecular weight of at least 100,000; from 7 to 92 volume percent of an inert filler; and from 0 to 10 volume percent of a plasticizer for said polyolefin, and the tube wall having pores at least 70 percent having a diameter of less than 0.3 micron and a mean pore diameter of less than 0.2 micron.
Claim 2
Dependent Claim
117 words
A hollow fiber suitable for ultrafiltration comprising a hollow tube structure having an average wall thickness of from 1 to 20 mils and an average inner diameter of said tube of from about 5 to about 500 mils, the tube wall being formed of a substantially uniform mixture of from 8 to 93 volume percent polyolefin having a weight average molecular weight of at least 100,000; from 7 to 92 volume percent of an inert filler; and from 0 to 10 volume percent of a plasticizer for said polyolefin, and the tube wall having pores at least 70 percent having a diameter of less than 0.3 micron and a mean pore diameter of less than 0.2 micron.
Claim 3
Dependent Claim
21 words
The hollow fiber of claim 1 wherein the polyolefin is selected from a high density polyethylene or a high density polypropylene.
Claim 4
Dependent Claim
54 words
The hollow fiber of claim 1 wherein the polyolefin is a mixture of from 5 to 95 weight percent of a polyolefin having an average molecular weight of from 100,000 to 500,000 and the corresponding 95 to 5 weight percent of a polyolefin having a weight average molecular weight of from 500,000 to 2,000,000.
Claim 5
Dependent Claim
28 words
The hollow fiber of claim 3 wherein the polyolefin of a weight average molecular weight of from 100,000 to 500,000 comprises the major component of the polyolefin mixture.
Claim 6
Dependent Claim
35 words
The hollow fiber of claim 1 wherein the plasticizer contained in the wall is less than 3 volume percent and the filler has a particle size diameter of from about 0.01 to about 10 micron.
Claim 7
Dependent Claim
20 words
The hollow fiber of claim 1 wherein the walls of said fiber has a void volume of at least 30%.
Claim 8
Dependent Claim
20 words
The hollow fiber of claim 2 wherein the walls of said fiber has a void volume of at least 30%.
Claim 9
Dependent Claim
20 words
The hollow fiber of claim 3 wherein the walls of said fiber has a void volume of at least 30%.
Claim 10
Dependent Claim
20 words
The hollow fiber of claim 4 wherein the walls of said fiber has a void volume of at least 30%.
Claim 11
Dependent Claim
20 words
The hollow fiber of claim 5 wherein the walls of said fiber has a void volume of at least 30%.
Claim 12
Dependent Claim
20 words
The hollow fiber of claim 1 wherein at least one wall of the fiber is coated with a polymeric membrane.
Claim 13
Dependent Claim
20 words
The hollow fiber of claim 2 wherein at least one wall of the fiber is coated with a polymeric membrane.
Claim 14
Dependent Claim
20 words
The hollow fiber of claim 3 wherein at least one wall of the fiber is coated with a polymeric membrane.
Claim 15
Dependent Claim
20 words
The hollow fiber of claim 4 wherein at least one wall of the fiber is coated with a polymeric membrane.
Claim 16
Dependent Claim
20 words
The hollow fiber of claim 5 wherein at least one wall of the fiber is coated with a polymeric membrane.
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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) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |