US4446015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field flow fractionation channel
Assignee: EIDP Inc
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Filing: 1981-11-30
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Granted: 1984-05-01
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Expires: 2001-11-30
Abstract
Abstract A free floating plastic channel for sedimentation field flow fractionation is suspended in a centrifuge rotor filled with a compensating liquid. The channel is constructed of a plastic central hub assembly fitted with a plastic outer ring preferably having a lower density than the hub. The outer ring contains a shallow channel on its radially inner surface and is interference-fitted to the inner ring to insure a liquid tight seal at zero force field. With the liquid totally surrounding the hub-outer ring assembly, stresses on the plastic parts are essentially equalized even under high force fields and leakage from the channel at the hub-ring interface is greatly reduced.
Inventors
- 👤 Joseph J. Kirkland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:25
CPC Classifications
B; B04; B04B; B04B5/00; B04B5/04; B04B5/0442; B03; B03B; B03B5/00; B04B2005/045; B04B2005/0464
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
119 words
In an apparatus for separating particulates suspended in a fluid medium according to their effective masses, said apparatus having an annular channel with an annulus axis, means for rotating said channel about said axis, means for passing said fluid medium circumferentially through said channel, and means for introducing said particulates into said medium for passage through said channel, said channel being defined by the interface between an outer ring and a hub mating with said outer ring, said hub and ring being mounted in a rotor adapted to contain a liquid that surrounds both the hub and ring during said rotation, the improvement wherein: said channel is defined by a groove in the inner surface of said outer ring.
Claim 2
Dependent Claim
119 words
In an apparatus for separating particulates suspended in a fluid medium according to their effective masses, said apparatus having an annular channel with an annulus axis, means for rotating said channel about said axis, means for passing said fluid medium circumferentially through said channel, and means for introducing said particulates into said medium for passage through said channel, said channel being defined by the interface between an outer ring and a hub mating with said outer ring, said hub and ring being mounted in a rotor adapted to contain a liquid that surrounds both the hub and ring during said rotation, the improvement wherein: said channel is defined by a groove in the inner surface of said outer ring.
Claim 3
Dependent Claim
73 words
A channel assembly forming a channel for sedimentation field flow fractionation comprising: a dislike hub having a smooth outer peripheral surface, a continuous outer ring having a radially inner surface, defining a circumferential groove, mating with said hub outer peripheral surface to define an annular channel at the interface between said surfaces, and radial bores in said hub communicating with said channel, both said hub and said ring being formed of a plastic.
Claim 4
Dependent Claim
73 words
A channel assembly forming a channel for sedimentation field flow fractionation comprising: a dislike hub having a smooth outer peripheral surface, a continuous outer ring having a radially inner surface, defining a circumferential groove, mating with said hub outer peripheral surface to define an annular channel at the interface between said surfaces, and radial bores in said hub communicating with said channel, both said hub and said ring being formed of a plastic.
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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) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |