Patent US4422081A successfully refreshed from Google Patents.
Patent US4483825A successfully refreshed from Google Patents.
US4483825A
Expired / Lapsed
US
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Pipette and filter combination
Assignee: Individual
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Filing: 1982-07-09
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Granted: 1984-11-20
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Expires: 2002-07-09
Abstract
Abstract A pipette having a liquid receiving hollow generally encompassed by deformable side walls, the pipette further has a tapered liquid outlet extending from one end of the hollow and a liquid inlet on the other end of the hollow within which is located a semi-permeable filter.
Inventors
- 👤 Keith R. Fatches
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:12
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/483; G01N33/487; G01N33/49; G01N33/491; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0208; B01D17/0214; B01D17/08; B01D17/085; B01D33/00; B01D33/01; B01D61/00; B01D61/14; B01D61/18; B01D63/00; B01D63/16; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/50; B01L3/502; B01L3/5021; Y; Y10; Y10T; Y10T436/00; Y10T436/25; Y10T436/25375; Y10T436/255
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A pipette for separating plasma from a centrifuged blood sample comprising a hollow tubular member terminating at opposite ends and constructed of a resilient, deformable material, a liquid inlet at one end of said hollow tubular member, and a semi-permeable filter located in said inlet wherein said filter permits only plasma to pass therethrough and enter into said hollow tubular member while preventing blood cells from entering said hollow tubular member, and a tapered liquid outlet extending from the other end of said hollow tubular member through which said filtered plasma is expelled by resilient deformation of the hollow tubular member.
Claim 2
Dependent Claim
101 words
A pipette for separating plasma from a centrifuged blood sample comprising a hollow tubular member terminating at opposite ends and constructed of a resilient, deformable material, a liquid inlet at one end of said hollow tubular member, and a semi-permeable filter located in said inlet wherein said filter permits only plasma to pass therethrough and enter into said hollow tubular member while preventing blood cells from entering said hollow tubular member, and a tapered liquid outlet extending from the other end of said hollow tubular member through which said filtered plasma is expelled by resilient deformation of the hollow tubular member.
Claim 3
Dependent Claim
26 words
The pipette of claim 1 wherein said liquid inlet has a peripheral surface dimension to slidingly sealingly co-operate with the internal surface of a test tube.
Claim 4
Dependent Claim
120 words
In combination, a pipette and syringe for separating plasma from a centrifuged blood sample, said pipette being received by the syringe for sealed telescopic relative motion therein and said pipette comprising a hollow tubular member terminating at opposite ends and constructed of a resilient, deformable material, a liquid inlet at one end of said hollow tubular member, and a semi-permeable filter located in said inlet wherein said filter permits only plasma to pass therethrough and enter into said hollow tubular member while preventing blood cells from entering said hollow tubular member, and a tapered liquid outlet extending from the other end of said hollow tubular member through which the filtered plasma is expelled by resiliently deforming said hollow tubular member.
Claim 5
Dependent Claim
120 words
In combination, a pipette and syringe for separating plasma from a centrifuged blood sample, said pipette being received by the syringe for sealed telescopic relative motion therein and said pipette comprising a hollow tubular member terminating at opposite ends and constructed of a resilient, deformable material, a liquid inlet at one end of said hollow tubular member, and a semi-permeable filter located in said inlet wherein said filter permits only plasma to pass therethrough and enter into said hollow tubular member while preventing blood cells from entering said hollow tubular member, and a tapered liquid outlet extending from the other end of said hollow tubular member through which the filtered plasma is expelled by resiliently deforming said hollow tubular member.
Claim 6
Dependent Claim
21 words
The pipette and syringe combination of claim 3 wherein said pipette further includes a removable cap sealingly located on said outlet.
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) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |