US4353795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field flow fractionation channel
Assignee: EIDP Inc
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Filing: 1981-04-01
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Granted: 1982-10-12
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Expires: 2001-04-01
Abstract
Abstract A sedimentation field flow fractionation channel is constructed to have an outer support ring and a continuous inner channel ring mating with the support ring to define the channel. The channel ring has a tension modulus capable of following centrifugally induced expansions of the support ring. The channel ring is weight loaded to facilitate its following support ring expansions.
Inventors
- 👤 William A. Romanauskas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:48
CPC Classifications
B; B03; B03B; B03B5/00; B04; B04B; B04B5/00; B04B5/04; B04B5/0442; B04B2005/045
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
112 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 and a continuous inner channel ring mating with said support ring to define said channel, said channel ring having a tension modulus capable of following centrifugally induced expansions of said support ring, and means to load said channel ring to follow said expansion.
Claim 2
Dependent Claim
112 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 and a continuous inner channel ring mating with said support ring to define said channel, said channel ring having a tension modulus capable of following centrifugally induced expansions of said support ring, and means to load said channel ring to follow said expansion.
Claim 3
Dependent Claim
27 words
An apparatus according to claim 1 wherein said channel ring is constructed of an elastomeric material capable of providing a liquid tight seal against said support ring.
Claim 4
Dependent Claim
26 words
An apparatus according to claim 1 or 2 wherein the annular thickness of said support ring is selected to permit minimal radial expansion under centrifugal force.
Claim 5
Dependent Claim
27 words
An apparatus according to claim 1 and 2 wherein said channel ring is loaded with embedded particles of higher density than the density of said channel ring.
Claim 6
Dependent Claim
27 words
An apparatus according to claim 1 or 2 wherein said channel ring is loaded by sector segments mounted on the inner circumferential surface of said channel ring.
Claim 7
Dependent Claim
32 words
An apparatus according to claim 5 wherein each said segment is U-shaped in radial cross section, thereby defining a circumferential slot adapted to enclose and prevent axial expansion of said channel ring.
Claim 8
Dependent Claim
28 words
An apparatus according to claim 6 wherein said support ring defines circumferential grooves on its radially inner surface adapted to slidingly receive the ends of said U-shaped segments.
Claim 9
Dependent Claim
41 words
An apparatus according to claim 7 wherein the axially central portions of said segments is loaded to produce an axial bulge of said channel ring conforming to the axial deformation of said support ring caused by said grooves under centrifugal force.
Claim 10
Dependent Claim
32 words
An apparatus according to claim 5 which includes a pair of axially spaced compression washers for supporting said support ring for rotation and statically loading said channel ring against said support ring.
Claim 11
Dependent Claim
34 words
An apparatus according to claim 1 or 2 which includes a pair of axially spaced compression washers for supporting said support ring for rotation and statically loading said channel ring against said support ring.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |