US3865731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter skimming device
Assignee: Baxter International Inc
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Filing: 1973-12-21
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Granted: 1975-02-11
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Expires: 1993-12-21
Abstract
Abstract A filter skimming device comprising an elongated plunger assembly adapted for telescopic insertion in a test tube. The plunger assembly has an elongated plunger tube, a filter element, an elongated tubular insert for collection of filtered fluid, and a molded-in channel in said tubular insert for carrying said filtered fluid from said filter to the interior of said insert.
Inventors
- 👤 Lamont J Seitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:49
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/50; B01L3/508; B01L3/5082; B01D; B01D33/00; B01D33/01; B01L3/502; B01L3/5021
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
170 words
A filter skimming device comprising an elongated plunger assembly, said assembly comprising an elongated outer plunger tube, an elongated tubular insert and a cylindrical filter element disposed therebetween, said plunger tube having a peripheral rim adapted for slidable sealing engagement of the inner walls of a test tube, a downwardly extending small bore probe and a projection on its inner bottom upon which said filter element is seated, said tubular insert being shorter in length than said plunger tube, being adapted to be inserted in snug relationship therewith and having a channel in its outer wall extending substantially throughout its entire length whereby a tubelike capillary space is formed between the outer wall of said tubular insert and the inner wall of said plunger tube, said tubular insert further having a projection on its outer bottom adapted for seating on said filter element, said channel terminating at a wall near the top and communicating with the interior of said tubular insert by a small bore opening transverse to said channel.
Claim 2
Dependent Claim
170 words
A filter skimming device comprising an elongated plunger assembly, said assembly comprising an elongated outer plunger tube, an elongated tubular insert and a cylindrical filter element disposed therebetween, said plunger tube having a peripheral rim adapted for slidable sealing engagement of the inner walls of a test tube, a downwardly extending small bore probe and a projection on its inner bottom upon which said filter element is seated, said tubular insert being shorter in length than said plunger tube, being adapted to be inserted in snug relationship therewith and having a channel in its outer wall extending substantially throughout its entire length whereby a tubelike capillary space is formed between the outer wall of said tubular insert and the inner wall of said plunger tube, said tubular insert further having a projection on its outer bottom adapted for seating on said filter element, said channel terminating at a wall near the top and communicating with the interior of said tubular insert by a small bore opening transverse to said channel.
Claim 3
Dependent Claim
23 words
The filter skimming device of claim 1 in which the probe is offset from the center of the bottom of said plunger tube.
Claim 4
Dependent Claim
25 words
The filter skimming device of claim 1 in which said plunger tube has a peripheral rim at the top and graduations on its outer wall.
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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 |