US5037549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the removal of serum separated from blood
Assignee: Individual
•
Filing: 1989-06-23
•
Granted: 1991-08-06
•
Expires: 2009-06-23
Abstract
Abstract A test tube is closed with a plug having a cannula piercing the center of the plug. A first collar surrounds the plug and a second collar above the first collar extends away from the plug and receives a tightly fitted serum container. The serum container is separated from a top opening to the cannula by a first air space. A second air space exists between a bottom of the plug and a top layer of a blood sample. A channel along an inner edge of the second collar allows serum to move upwards into the serum container during a centrifuge process by virtue of increased air pressure within the test tube caused by the serum container pressing on the first air space.
Inventors
- 👤 Uwe Ballies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:09
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/483; G01N33/487; G01N33/49; G01N33/491
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
178 words
A device for the removal of a serum which is separated from a blood cake through centrifugation of a test tube, closed at least on one side by a plug having a lower annular portion in contact with an inner top wall of the test tube, the device comprising a top essentially rotationally symmetrical and furnished with a first annular collar enclosing an outer top wall of the test tube together with the plug and a cannula integral with a lower portion of the top penetrating the plug, a serum container for receiving a part of the serum separated during centrifugation in the test tube, the top provided with a second annular collar extending away from the first collar and receiving the serum container in a tight piston-like fit, an inner lower wall portion of the second collar providing a passage together with an outer wall of the serum container from the cannula to an interior of the serum container, the passage opening to allow serum to flow only when the serum container is lowered to the plug.
Claim 2
Independent Claim
178 words
A device for the removal of a serum which is separated from a blood cake through centrifugation of a test tube, closed at least on one side by a plug having a lower annular portion in contact with an inner top wall of the test tube, the device comprising a top essentially rotationally symmetrical and furnished with a first annular collar enclosing an outer top wall of the test tube together with the plug and a cannula integral with a lower portion of the top penetrating the plug, a serum container for receiving a part of the serum separated during centrifugation in the test tube, the top provided with a second annular collar extending away from the first collar and receiving the serum container in a tight piston-like fit, an inner lower wall portion of the second collar providing a passage together with an outer wall of the serum container from the cannula to an interior of the serum container, the passage opening to allow serum to flow only when the serum container is lowered to the plug.
Claim 3
Dependent Claim
48 words
A device in accordance with claim 1, wherein the passage is formed as a groove along the inner lower wall portion of the second collar and is located at least partially above an upper edge of the serum container when the serum container is lowered to the plug.
Claim 4
Dependent Claim
20 words
A device in accordance with claim 1 or 2, wherein the passage is so formed that it holds back fibers.
Claim 5
Dependent Claim
16 words
A device in accordance with claim 1 or 2, wherein a cap closes the serum container.
References Cited (Backward Citations)
US3850174A
Cited
US3865731A
Cited
US4052320A
Cited
US4046699A
Cited
FR2383710A1
Cited
US4154690A
Cited
US4472180A
Cited
US4602995A
Cited
US4891134A
Cited
US4957637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-05 | 1995-02-04 | 1995-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-05 | 1999-02-04 | 1999-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-05 | 2003-02-04 | 2003-08-06 | $7700.00 | Window Closed / Lapsed |