Patent US3891547A successfully refreshed from Google Patents.
US3891547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permeable hollow fiber filter
Assignee: California Institute of Technology
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Filing: 1974-04-08
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Granted: 1975-06-24
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Expires: 1994-04-08
Abstract
Abstract A fluid filter is provided wherein the fibers of the filter constitute hollow tubes which are terminated at their respective ends in manifolds. A fluid is pumped through these manifolds which increases the ability of the hollow fibers to intercept and retain the particles which it is desired to remove from the fluid being filtered.
Inventors
- 👤 Daniel P Y Chang
- 👤 Sheldon K Friedlander
- 👤 Institute Of Techno California
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:39
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D39/00; B01D39/08; B01D39/083; B01D39/14; B01D61/00; B01D61/14; B01D61/18; B01D63/00; B01D63/02; B01D63/026; B01D69/00; B01D69/08; B01D2239/00; B01D2239/04; B01D2239/0471; B01D2239/12; B01D2239/1233
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
63 words
A METHOD OF IMPROVING THE PARTICULATE MATTER COLLECTION EFFICIENCY OF A HALLOW FIBER MESH FILTER COMPRISING FLOWING A CARRIER SOLUTION CONTAINING PARTICULATE MATTER TO BE COLLECTED BETWEEN THE FIBERS OF SAID HALLOW FIBER MESH FILTER, SAID FIBERS BEING SUBSTANTIALLY NONPERMEABLE TO SAID PARTICULATE MATTER AND BEING CONSTRUCTED AND ARRANGED TO PERMIT THE PASSAGE OF THE CARRIER FLUID THEREBETWEEN WHILE INTERCEPTING THE PARTICULATE MATTER.
Claim 2
Independent Claim
63 words
A METHOD OF IMPROVING THE PARTICULATE MATTER COLLECTION EFFICIENCY OF A HALLOW FIBER MESH FILTER COMPRISING FLOWING A CARRIER SOLUTION CONTAINING PARTICULATE MATTER TO BE COLLECTED BETWEEN THE FIBERS OF SAID HALLOW FIBER MESH FILTER, SAID FIBERS BEING SUBSTANTIALLY NONPERMEABLE TO SAID PARTICULATE MATTER AND BEING CONSTRUCTED AND ARRANGED TO PERMIT THE PASSAGE OF THE CARRIER FLUID THEREBETWEEN WHILE INTERCEPTING THE PARTICULATE MATTER.
Claim 3
Dependent Claim
98 words
In a mesh filter of the type wherein a plurality of hollow fibers are constructed and arranged to permit the passage of fluid therebetween while intercepting particulate matter which is in said solution, said fibers being substantially nonpermeable to said particulate matter the method of improving the efficiency of said filter comprising: evacuating fluid from the interior of said plurality of hollow fibers to which said hollow fiber walls is slightly pervious to modify the interface region between said hollow fiber walls and said solution to enable more particulate matter to impinge on said plurality of fiber walls.
Claim 4
Dependent Claim
98 words
In a mesh filter of the type wherein a plurality of hollow fibers are constructed and arranged to permit the passage of fluid therebetween while intercepting particulate matter which is in said solution, said fibers being substantially nonpermeable to said particulate matter the method of improving the efficiency of said filter comprising: evacuating fluid from the interior of said plurality of hollow fibers to which said hollow fiber walls is slightly pervious to modify the interface region between said hollow fiber walls and said solution to enable more particulate matter to impinge on said plurality of fiber walls.
Claim 5
Independent Claim
130 words
A method of improving the efficiency of the removal of particles from a solution by a mesh filter of the type wherein a plurality of hollow fibers are constructed and arranged to permit the passage of fluid therebetween while intercepting particulate matter which is in said solution comprising applying said solution containing particulate matter to one side of said filter to pass therethrough, said hollow fibers being substantially nonpermeable to said particulate matter, and reducing the viscosity of the solution in the region around the outsides of said hollow fibers while said solution is passing through said filter by passing water through said hollow fibers to which said fiber walls are slightly permeable to thereby reduce the hydrodynamic resistance to the interception of said particulate matter by said holloW fibers.
Claim 6
Independent Claim
130 words
A method of improving the efficiency of the removal of particles from a solution by a mesh filter of the type wherein a plurality of hollow fibers are constructed and arranged to permit the passage of fluid therebetween while intercepting particulate matter which is in said solution comprising applying said solution containing particulate matter to one side of said filter to pass therethrough, said hollow fibers being substantially nonpermeable to said particulate matter, and reducing the viscosity of the solution in the region around the outsides of said hollow fibers while said solution is passing through said filter by passing water through said hollow fibers to which said fiber walls are slightly permeable to thereby reduce the hydrodynamic resistance to the interception of said particulate matter by said holloW fibers.
Claim 7
Independent Claim
162 words
The method of improving the efficiency of the removal of particulate matter from a solution by a mesh filter of the type wherein a plurality of hollow fibers are constructed and arranged to permit the passage of fluid therebetween while intercepting particulate matter which is in said solution, said fibers being substantially nondiffusible by said particulate matter, comprising applying said solution containing particulate matter to one side of said filter to pass between said hollow fibers, and altering the charge on the outer walls of said hollow fibers and in the regions of said solution adjacent thereto while said solution is passing through said filter by passing a fluid through said hollow fibers to which said fiber walls are only slightly permeable, where said fluid is one of the group consisting of a solution of an electrolyte and a solution of a polyelectrolyte, to minimize charge repulsion of particulate matter and to improve the efficiency of particulate matter collection by said fibers.
Claim 8
Independent Claim
162 words
The method of improving the efficiency of the removal of particulate matter from a solution by a mesh filter of the type wherein a plurality of hollow fibers are constructed and arranged to permit the passage of fluid therebetween while intercepting particulate matter which is in said solution, said fibers being substantially nondiffusible by said particulate matter, comprising applying said solution containing particulate matter to one side of said filter to pass between said hollow fibers, and altering the charge on the outer walls of said hollow fibers and in the regions of said solution adjacent thereto while said solution is passing through said filter by passing a fluid through said hollow fibers to which said fiber walls are only slightly permeable, where said fluid is one of the group consisting of a solution of an electrolyte and a solution of a polyelectrolyte, to minimize charge repulsion of particulate matter and to improve the efficiency of particulate matter collection by said fibers.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |