US3870639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering device
Assignee: Moore Perk Corp
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Filing: 1974-01-02
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Granted: 1975-03-11
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Expires: 1994-01-02
Abstract
Abstract A device for filtering liquids such as blood and other body fluids to separate the fluid and particulate components thereof and to confine the particulate content. An open-ended inner tube is provided at its lower end with an integral flexible lip which slidably and sealingly engages the inside surface of an outer tube containing the liquid to be filtered. Within the inner tube''s lower end is a retainer sleeve having a flow passage extending axially therethrough. A filter membrane extends over one end of the sleeve and also between opposing side walls of the sleeve and inner tube to perform the dual functions of filtering fluid flowing through the passage as the inner tube is urged into the liquid-containing outer tube, and of forming a sealing gasket for securing the sleeve and membrane in place within the inner tube. A stop shoulder limits the extent to which the sleeve and membrane may be forced axially into the inner tube.
Inventors
- 👤 Francis C Moore
- 👤 Leon R Perkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:56
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/50; B01L3/502; B01L3/5021; B01D; B01D33/00; B01D33/01
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
214 words
A device for filtering liquids to separate and confine the particulates contained therein, comprising an outer tube closed at the lower end thereof and adapted to contain the liquid to be filtered, an open-ended inner tube, and flexible lip means projecting outwardly at the lower end of said inner tube for slidably and sealingly engaging the inside surface of said outer tube, wherein the improvement comprises a filter retaining sleeve having an outer surface with a diameter slightly smaller than the inside diameter of said inner tube at the lower end thereof and having a relatively large flow passage extending axially therethrough, said retaining sleeve being disposed within the lower end of said inner tube, and a thin flexible membrane filter of generally circular configuration having planar dimensions substantially larger than the inside diameter of said inner tube, said filter membrane having a central portion extending over one end of said sleeve and have a peripheral skirt portion tightly interfitted between the outer surface of said sleeve and the inside surface of the inner tube at the lower end thereof, said filter membrane thereby being supported to filter liquid flowing through the flow passage of said sleeve and providing a sealing gasket for securing the sleeve and membrane in place within the inner tube.
Claim 2
Independent Claim
214 words
A device for filtering liquids to separate and confine the particulates contained therein, comprising an outer tube closed at the lower end thereof and adapted to contain the liquid to be filtered, an open-ended inner tube, and flexible lip means projecting outwardly at the lower end of said inner tube for slidably and sealingly engaging the inside surface of said outer tube, wherein the improvement comprises a filter retaining sleeve having an outer surface with a diameter slightly smaller than the inside diameter of said inner tube at the lower end thereof and having a relatively large flow passage extending axially therethrough, said retaining sleeve being disposed within the lower end of said inner tube, and a thin flexible membrane filter of generally circular configuration having planar dimensions substantially larger than the inside diameter of said inner tube, said filter membrane having a central portion extending over one end of said sleeve and have a peripheral skirt portion tightly interfitted between the outer surface of said sleeve and the inside surface of the inner tube at the lower end thereof, said filter membrane thereby being supported to filter liquid flowing through the flow passage of said sleeve and providing a sealing gasket for securing the sleeve and membrane in place within the inner tube.
Claim 3
Independent Claim
214 words
A device for filtering liquids to separate and confine the particulates contained therein, comprising an outer tube closed at the lower end thereof and adapted to contain the liquid to be filtered, an open-ended inner tube, and flexible lip means projecting outwardly at the lower end of said inner tube for slidably and sealingly engaging the inside surface of said outer tube, wherein the improvement comprises a filter retaining sleeve having an outer surface with a diameter slightly smaller than the inside diameter of said inner tube at the lower end thereof and having a relatively large flow passage extending axially therethrough, said retaining sleeve being disposed within the lower end of said inner tube, and a thin flexible membrane filter of generally circular configuration having planar dimensions substantially larger than the inside diameter of said inner tube, said filter membrane having a central portion extending over one end of said sleeve and have a peripheral skirt portion tightly interfitted between the outer surface of said sleeve and the inside surface of the inner tube at the lower end thereof, said filter membrane thereby being supported to filter liquid flowing through the flow passage of said sleeve and providing a sealing gasket for securing the sleeve and membrane in place within the inner tube.
Claim 4
Independent Claim
214 words
A device for filtering liquids to separate and confine the particulates contained therein, comprising an outer tube closed at the lower end thereof and adapted to contain the liquid to be filtered, an open-ended inner tube, and flexible lip means projecting outwardly at the lower end of said inner tube for slidably and sealingly engaging the inside surface of said outer tube, wherein the improvement comprises a filter retaining sleeve having an outer surface with a diameter slightly smaller than the inside diameter of said inner tube at the lower end thereof and having a relatively large flow passage extending axially therethrough, said retaining sleeve being disposed within the lower end of said inner tube, and a thin flexible membrane filter of generally circular configuration having planar dimensions substantially larger than the inside diameter of said inner tube, said filter membrane having a central portion extending over one end of said sleeve and have a peripheral skirt portion tightly interfitted between the outer surface of said sleeve and the inside surface of the inner tube at the lower end thereof, said filter membrane thereby being supported to filter liquid flowing through the flow passage of said sleeve and providing a sealing gasket for securing the sleeve and membrane in place within the inner tube.
Claim 5
Dependent Claim
24 words
The device of claim 1 in which said filter membrane is resilient and has its skirt portion compressed between said sleeve and inner tube.
Claim 6
Dependent Claim
17 words
The device of claim 2 in which said filter membrane is formed of fibrous non-woven sheet material.
Claim 7
Dependent Claim
41 words
The device of claim 2 in which said filter membrane comprises inner and outer layers, one of said layers being formed of fibrous non-woven sheet material and the other of said layers being formed of porous substantially non-linting plastic sheet material.
Claim 8
Dependent Claim
22 words
The device of claim 1 in which said central portion of said filter membrane extends over the upper end of said sleeve.
Claim 9
Dependent Claim
69 words
The device of claim 5 in which said filter membrane comprises an inner layer and an outer layer, the inner layer having its skirt portion directly engaging the outer surface of said sleeve and said outer layer directly engaging the inside surface of said inner tube, said inner layer being formed of fibrous non-woven sheet material and said outer layer being formed of porous substantially non-linting plastic sheet material.
Claim 10
Independent Claim
244 words
A device for filtering liquids to separate and confine the particulates contained therein, comprising an outer tube closed at the lower end thereof and adapted to contain the liquid to be filtered, an open-ended inner tube, and flexible lip means projecting outwardly from the lower end of said inner tube for slidably and sealingly engaging the inside surface of said outer tube, wherein the improvement comprises said inner tube being internally enlarged at the lower end portion thereof to define a cylindrical recess terminating in an annular shoulder spaced from the inner tube''s lower end, a filter retaining sleeve having an outer surface with a diameter slightly smaller than said recess and having a relatively large flow passage extending axially therethrough, said retaining sleeve being disposed within said cylindrical recess, and a thin flexible filter membrane of generally circular configuration having planar dimensions substantially larger than the inside diameter of said inner tube, said filter membrane having a central portion eXtending over the upper end of said sleeve and engaging said shoulder of said inner tube, said membrane also having a peripheral skirt portion extending downwardly about the outer surface of said sleeve and being tightly interfitted between the sleeve''s outer surface and the surface of said cylindrical recess, said filter membrane thereby being supported to filter liquid flowing upwardly through the flow passage of said sleeve and providing a sealing gasket for securing the sleeve and membrane in place within said inner tube.
Claim 11
Independent Claim
244 words
A device for filtering liquids to separate and confine the particulates contained therein, comprising an outer tube closed at the lower end thereof and adapted to contain the liquid to be filtered, an open-ended inner tube, and flexible lip means projecting outwardly from the lower end of said inner tube for slidably and sealingly engaging the inside surface of said outer tube, wherein the improvement comprises said inner tube being internally enlarged at the lower end portion thereof to define a cylindrical recess terminating in an annular shoulder spaced from the inner tube''s lower end, a filter retaining sleeve having an outer surface with a diameter slightly smaller than said recess and having a relatively large flow passage extending axially therethrough, said retaining sleeve being disposed within said cylindrical recess, and a thin flexible filter membrane of generally circular configuration having planar dimensions substantially larger than the inside diameter of said inner tube, said filter membrane having a central portion eXtending over the upper end of said sleeve and engaging said shoulder of said inner tube, said membrane also having a peripheral skirt portion extending downwardly about the outer surface of said sleeve and being tightly interfitted between the sleeve''s outer surface and the surface of said cylindrical recess, said filter membrane thereby being supported to filter liquid flowing upwardly through the flow passage of said sleeve and providing a sealing gasket for securing the sleeve and membrane in place within said inner tube.
Claim 12
Dependent Claim
24 words
The device of claim 7 in which said filter membrane is resilient and has its skirt portion compressed between said sleeve and inner tube.
Claim 13
Dependent Claim
17 words
The device of claim 8 in which said filter membrane comprises a sheet of fibrous non-woven material.
Claim 14
Dependent Claim
69 words
The device of claim 9 in which said filter membrane comprises an inner layer and an outer layer, said inner layer having its skirt portion directly engaging the outer surface of said sleeve and said outer layer directly engaging the inside surface of said inner tube, said inner layer being formed of fibrous non-woven sheet material and said outer layer being formed of porous substantially non-linting plastic sheet material.
Claim 15
Dependent Claim
201 words
An open-ended filter tube adapted for insertion into a liquid-containing sample tube for the purpose of filtering said liquid and confining the particulates contained therein, said filter tube having a flexible lip extending about the open lower end thereof for slidably and sealingly engaging the inside surface of a sample tube, wherein the improvement comprises: a filter retaining sleeve having an outer surface with a diameter slightly smaller than the inside diameter of said filter tube at the lower end thereof and having a relatively large flow passage extending axially therethrough, said retaining sleeve being disposed within the lower end portion of said inner tube, and a thin flexible filter membrane having planar dimensions substantially larger than the inside diameter of said filter tube, said filter membrane having a central portion extending across one end of said sleeve and having a peripheral skirt portion tightly interfitted between the outer surface of said sleeve and the inside surface of said filter tube at the lower end portion thereof, said filter membrane thereby being supported to filter liquid flowing through the flow passage of said sleeve and providing sealing means for frictionally securing the sleeve and membrane in place within said filter tube.
Claim 16
Dependent Claim
201 words
An open-ended filter tube adapted for insertion into a liquid-containing sample tube for the purpose of filtering said liquid and confining the particulates contained therein, said filter tube having a flexible lip extending about the open lower end thereof for slidably and sealingly engaging the inside surface of a sample tube, wherein the improvement comprises: a filter retaining sleeve having an outer surface with a diameter slightly smaller than the inside diameter of said filter tube at the lower end thereof and having a relatively large flow passage extending axially therethrough, said retaining sleeve being disposed within the lower end portion of said inner tube, and a thin flexible filter membrane having planar dimensions substantially larger than the inside diameter of said filter tube, said filter membrane having a central portion extending across one end of said sleeve and having a peripheral skirt portion tightly interfitted between the outer surface of said sleeve and the inside surface of said filter tube at the lower end portion thereof, said filter membrane thereby being supported to filter liquid flowing through the flow passage of said sleeve and providing sealing means for frictionally securing the sleeve and membrane in place within said filter tube.
Claim 17
Dependent Claim
28 words
The filter tube of claim 11 in which said membrane is resilient and has its skirt portion compressed between said sleeve and the inner surface of said tube.
Claim 18
Dependent Claim
18 words
The filter tube of claim 12 in which said membrane comprises a sheet of fibrous non-woven filter material.
Claim 19
Dependent Claim
41 words
The filter tube of claim 12 in which said membrane comprises inner and outer layers, one of said layers being formed of fibrous non-woven sheet material and the other of said layers being formed of porous substantially non-linting plastic sheet material.
Claim 20
Dependent Claim
19 words
The filter tube of claim 11 in which said filter membrane extends over the upper end of said sleeve.
Claim 21
Dependent Claim
44 words
The filter tube of claim 15 in which the lower end of said tube is internally enlarged to define a cylindrical recess terminating in an annular shoulder spaced from the tube''s lower end, said central portion of said filter membrane engaging said annular shoulder.
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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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |