Patent US4283276A successfully refreshed from Google Patents.
US4283276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor for sedimentation field flow fractionation
Assignee: EIDP Inc
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Filing: 1980-02-29
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Granted: 1981-08-11
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Expires: 2000-02-29
Abstract
Abstract A long, thin annular belt-like channel is designed for use in sedimentation field flow fractionation. This channel, which is the rotor of a centrifuge, is designed to maintain its thickness dimension constant and yet facilitate its manufacture and cleaning by forming the rotor of a double mating ring in which the inner ring is split. This permits the inner ring to conform to the outer load carrying ring.
Inventors
- 👤 John W. Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:02
CPC Classifications
B; B04; B04B; B04B5/00; B04B5/04; B04B5/0442; B03; B03B; B03B5/00; B04B2005/045; G; G01; G01N; G01N30/00; G01N30/0005; G01N2030/0015; G01N2030/002
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
97 words
In an apparatus for separating particulates suspended in a fluid medium according to their effective masses, said apparatus having an annular cylindrical channel with a cylinder 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, the improvement wherein said channel comprises: an outer support ring having a constant inner radius, and a unitary inner ring, separated at one point along its circumference, mating with said outer ring to define said channel there between.
Claim 2
Dependent Claim
97 words
In an apparatus for separating particulates suspended in a fluid medium according to their effective masses, said apparatus having an annular cylindrical channel with a cylinder 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, the improvement wherein said channel comprises: an outer support ring having a constant inner radius, and a unitary inner ring, separated at one point along its circumference, mating with said outer ring to define said channel there between.
Claim 3
Dependent Claim
25 words
An apparatus of claim 1 wherein said inner ring has an outer wall, the middle portion of which defines a circumferential groove of constant depth.
Claim 4
Dependent Claim
26 words
An apparatus of claim 2 wherein a resilient circumferential seal is positioned between said rings along the edges of said channel, thereby to seal said channel.
Claim 5
Dependent Claim
30 words
An apparatus of claim 1, 2 or 3, which includes an orifice through said inner ring at each end of said channel thereby to afford fluid access to said channel.
Claim 6
Dependent Claim
30 words
An apparatus of claim 4 wherein said inner ring has a circumferential, radial flange defining an L-shaped cross-section, whereby said inner ring flange is axially supported by said outer ring.
Claim 7
Dependent Claim
32 words
An apparatus of claim 5 which includes a wedge frictionally engaging each longitudinal end of said inner ring, thereby to maintain said ring spread to contact said outer ring at all times.
Claim 8
Dependent Claim
26 words
An apparatus of claim 1 wherein a resilient circumferential seal is positioned between said rings along the edges of said channel, thereby to seal said channel.
Claim 9
Dependent Claim
27 words
An apparatus of claim 7 which includes an orifice through said inner ring at each end of said channel thereby to afford fluid access to said channel.
Claim 10
Dependent Claim
30 words
An apparatus of claim 1 wherein said inner ring has a circumferential, radial flange defining an L-shaped cross-section, whereby said inner ring flange is axially supported by said outer ring.
Claim 11
Dependent Claim
32 words
An apparatus of claim 9 which includes a wedge frictionally engaging each longitudinal end of said inner ring, thereby to maintain said ring spread to contact said outer ring at all times.
Claim 12
Dependent Claim
44 words
An apparatus of claim 9 which includes a wedge frictionally engaging each longitudinal end of said inner ring, thereby to maintain said ring spread to contact said outer ring at all times wherein said apparatus includes a bowl-like rotor adapted to support said channel.
References Cited (Backward Citations)
GB2002266A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |