Patent US4222977A successfully refreshed from Google Patents.
US4222977A
Expired / Lapsed
US
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Process to produce inorganic hollow fibers
Assignee: Permea Inc
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Filing: 1978-05-16
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Granted: 1980-09-16
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Expires: 1998-05-16
Abstract
Abstract Process for the production of small tubing, e.g., hollow fibers comprising (a) preparing a solution of an organic fiber-forming polymer, containing, in a uniformly dispersed form, a sinterable inorganic material; (b) extruding the inorganic material-containing polymer solution through a hollow fiber spinneret; (c) forming a polymeric precursor hollow fiber, laden with the inorganic material; (d) treating the polymeric precursor hollow fiber to remove the organic polymer; and (e) sintering the resulting inorganic material in hollow fiber form.
Inventors
- 👤 Emerick J. Dobo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:13
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/24; B; B01; B01D; B01D67/00; B01D67/0039; B01D67/0041; B01D67/00411; B01D69/00; B01D69/08; B01D69/087; B01D69/088; B01D71/00; B01D71/02; B01D71/024; B22; B22F; B22F1/00; B22F1/06; B22F1/062; B22F5/00; B22F5/10; C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/022; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C04B35/62231; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63444; B22F2999/00; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57; Y10; Y10S; Y10S264/00; Y10S264/19; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/1216; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
80 words
A process comprising (a) preparing a solution of an organic fiber-forming polymer, containing, in a uniformly dispersed form, a sinterable inorganic material; (b) extruding the inorganic material-containing polymer solution through a hollow fiber spinneret; (c) forming a polymeric precursor hollow fiber, laden with the inorganic material; (d) treating the polymeric precursor hollow fiber to remove the organic polymer; and (e) sintering the inorganic material; provided that steps (d) and (e) are conducted under conditions that maintain a hollow fiber form.
Claim 2
Dependent Claim
80 words
A process comprising (a) preparing a solution of an organic fiber-forming polymer, containing, in a uniformly dispersed form, a sinterable inorganic material; (b) extruding the inorganic material-containing polymer solution through a hollow fiber spinneret; (c) forming a polymeric precursor hollow fiber, laden with the inorganic material; (d) treating the polymeric precursor hollow fiber to remove the organic polymer; and (e) sintering the inorganic material; provided that steps (d) and (e) are conducted under conditions that maintain a hollow fiber form.
Claim 3
Dependent Claim
27 words
The process according to claim 1 wherein the inorganic material dispersed in the polymer solution comprises a metal compound which is reduced prior to or during sintering.
Claim 4
Dependent Claim
19 words
The process according to claim 2 wherein the inorganic material dispersed in the polymer solution comprises a metal oxide.
Claim 5
Dependent Claim
32 words
The process according to claim 3 wherein the metal oxide dispersed in the polymer solution comprises nickel oxide or nickel oxide and an oxide of a metal that forms a nickel alloy.
Claim 6
Dependent Claim
18 words
The process according to claim 4 wherein the metal oxide that forms a nickel alloy is iron oxide.
Claim 7
Dependent Claim
24 words
A process according to claims 1, 2, 3, 4 or 5 wherein the inorganic material-containing polymer solution is extruded directly into a coagulating bath.
Claim 8
Dependent Claim
22 words
A process according to claim 6 wherein a coagulating agent is injected into the bore of the fiber as it is extruded.
Claim 9
Dependent Claim
12 words
A process according to claim 6 wherein the coagulating agent comprises water.
Claim 10
Dependent Claim
26 words
A process according to claims 1, 2, 3, 4 or 5 wherein the inorganic material-containing polymer solution passes through a gas before contacting the coagulating bath.
Claim 11
Dependent Claim
22 words
A process according to claim 9 wherein a coagulating agent is injected into the bore of the fiber as it is extruded.
Claim 12
Dependent Claim
12 words
A process according to claim 9 wherein the coagulating agent comprises water.
Claim 13
Dependent Claim
13 words
A process according to claim 6 wherein the coagulating agent comprises ethylene glycol.
Claim 14
Dependent Claim
13 words
A process according to claim 9 wherein the coagulating agent comprises ethylene glycol.
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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) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |