US3864979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blood sedimentation tube barrier
Assignee: Becton Dickinson and Co
•
Filing: 1973-03-30
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Granted: 1975-02-11
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Expires: 1993-03-30
Abstract
Abstract A liquid collection tube, such as a blood sedimentation tube, has, within, a barrier plug which permits air to pass therethrough but prevents the passage of liquid beyond the bottom of the barrier plug. The barrier plug has a resilient non-porous outer portion which engages the walls of the tube and a central porous core which is formed of a plurality of vertical adjacent filaments.
Inventors
- 👤 Waldemar A Ayres
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:32
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/0213; B01L2200/00; B01L2200/08; B01L2200/085; B01L2200/14; B01L2200/141; G; G01; G01N; G01N35/00; G01N35/10; G01N35/1009; G01N35/1016; G01N2035/102; G01N2035/1023
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
186 words
A liquid collection tube comprising; a hollow transparent tube open at the top and bottom, a barrier plug mounted in the tube intermediate the open ends thereof, the plug having a porous portion and being mounted in the tube at a predetermined location so that when the bottom open end is placed in liquid to be collected and suction is applied to the top open end, the porous portion of the plug will permit air to pass therethrough and draw liquid into the tube up to the bottom of the barrier plug and not through the porous portion, thereby automatically stopping the height of the liquid column entering the tube and preventing liquid from progressing above the barrier plug, the barrier plug being cylindrical in configuration with a non-porous portion forming an outer part of the plug and the porous portion forming a central core concentric with the non-porous portion of the plug whereby the non-porous portion engages the side walls of the tube, and the porous portion being formed of a plurality of vertical adjacent filaments and the non-porous portion being of a resilient material.
Claim 2
Dependent Claim
186 words
A liquid collection tube comprising; a hollow transparent tube open at the top and bottom, a barrier plug mounted in the tube intermediate the open ends thereof, the plug having a porous portion and being mounted in the tube at a predetermined location so that when the bottom open end is placed in liquid to be collected and suction is applied to the top open end, the porous portion of the plug will permit air to pass therethrough and draw liquid into the tube up to the bottom of the barrier plug and not through the porous portion, thereby automatically stopping the height of the liquid column entering the tube and preventing liquid from progressing above the barrier plug, the barrier plug being cylindrical in configuration with a non-porous portion forming an outer part of the plug and the porous portion forming a central core concentric with the non-porous portion of the plug whereby the non-porous portion engages the side walls of the tube, and the porous portion being formed of a plurality of vertical adjacent filaments and the non-porous portion being of a resilient material.
Claim 3
Dependent Claim
17 words
The invention in accordance with claim 1 wherein the liquid containing tube is a blood sedimentation tube
Claim 4
Dependent Claim
23 words
The invention in accordance with claim 1 wherein the filament material is wool fibers and the resilient nonporous material is a white elastomer.
Claim 5
Dependent Claim
13 words
The invention in accordance with claim 1 wherein the filaments are plastic monofilaments.
Claim 6
Dependent Claim
182 words
A barrier plug adapted to be mounted in a hollow tube with open top and bottom ends comprising; a body at least partially porous and being adapted to be mounted at a predetermined location and in sealing engagement with the inner walls of the hollow tube, whereby when the bottom open end is placed in liquid to be collected and suction is applied to the top open end on the tube, the porous portion of the plug will permit air to pass therethrough and draw liquid into the tube up to the bottom of the barrier plug and not through the porous portion thereby automatically controlling the amount of liquid entering the tube and preventing liquid from progressing above the barrier plug, the plug including an outer cylindrical concentric non-porous portion and an inner porous core portion concentric with the outer portion to form a cylindrical plug, the non-porous portion being made of resilient material and the porous portion being made of a plurality of vertical filaments adjacent to one another and positioned within the non-porous portion to form a core therein.
Claim 7
Dependent Claim
182 words
A barrier plug adapted to be mounted in a hollow tube with open top and bottom ends comprising; a body at least partially porous and being adapted to be mounted at a predetermined location and in sealing engagement with the inner walls of the hollow tube, whereby when the bottom open end is placed in liquid to be collected and suction is applied to the top open end on the tube, the porous portion of the plug will permit air to pass therethrough and draw liquid into the tube up to the bottom of the barrier plug and not through the porous portion thereby automatically controlling the amount of liquid entering the tube and preventing liquid from progressing above the barrier plug, the plug including an outer cylindrical concentric non-porous portion and an inner porous core portion concentric with the outer portion to form a cylindrical plug, the non-porous portion being made of resilient material and the porous portion being made of a plurality of vertical filaments adjacent to one another and positioned within the non-porous portion to form a core therein.
Claim 8
Dependent Claim
13 words
The invention in accordance with claim 1 wherein the filaments are plastic monofilaments.
Claim 9
Dependent Claim
22 words
The invention in accordance with claim 1 wherein the filaments are wool fibers and the non-porous portion is of white resilient material.
References Cited (Backward Citations)
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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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |