Patent US4738656A successfully refreshed from Google Patents.
US4738656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite material rotor
Assignee: Beckman Coulter Inc
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Filing: 1986-04-09
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Granted: 1988-04-19
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Expires: 2006-04-09
Abstract
Abstract A composite material rotor is disclosed which is made from a plurality of stacked and bonded epoxied filament wound discs, each disc providing a specially wound construction so that the modulus of the rotor body may be varied in proportion to the maximum stress encountered by the rotor during ultracentrifugation. Such a layered disc assembly allows the rotor to be fine-tuned to respond to a variety of stress encountered during ultracentrifugation. Where upper hoop stress is greater, upper disc 28 might be wound using a higher modulus filament fiber than the fiber used by disc 26.
Inventors
- 👤 Alireza Piramoon
- 👤 Robert Carey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:05
CPC Classifications
B; B04; B04B; B04B7/00; B04B7/08; B04B7/085; B04B5/00; B04B5/04; B04B5/0407; B04B5/0414
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
60 words
A centrifuge rotor comprising: a body having a plurality of anisotropic material layers comprising cured resin impregnated fiber discs with enhanced strength of material properties in the radial direction; each layer having fiber of a particular modulus, said modulus being predetermined to accommodate the particular stress of each said layer during centrifuge operation of said rotor stressing said discs radially.
Claim 2
Dependent Claim
60 words
A centrifuge rotor comprising: a body having a plurality of anisotropic material layers comprising cured resin impregnated fiber discs with enhanced strength of material properties in the radial direction; each layer having fiber of a particular modulus, said modulus being predetermined to accommodate the particular stress of each said layer during centrifuge operation of said rotor stressing said discs radially.
Claim 3
Dependent Claim
33 words
The centrifuge rotor of claim 1, wherein each of said layers is a fiber filament wound composite material radially extending disc, each of said discs being secured together by resin, layer to layer.
Claim 4
Dependent Claim
31 words
The centrifuge rotor of claim 2, including a reorientation of the direction of the filament in selected anisotropic layers to accommodate the insertion and support of a plurality of test tubes.
Claim 5
Dependent Claim
28 words
The centrifuge rotor of claim 3, wherein the filament is reoriented at an angle to the horizontal plane of the rotor within a range of 35° to 55°.
Claim 6
Dependent Claim
30 words
The centrifuge rotor of claim 3, wherein the filament in selected anisotropic layers of the rotor is reoriented approximately at a 45° angle to the horizontal plane of the rotor.
Claim 7
Dependent Claim
19 words
The centrifuge rotor of claim 2 or 3, wherein the fiber filament is graphite and the resin is epoxy.
Claim 8
Dependent Claim
14 words
The centrifuge rotor of claim 2 or 3, wherein the resin has thermoplastic properties.
Claim 9
Dependent Claim
14 words
The centrifuge rotor of claim 2 or 3, wherein the resin has thermoset properties.
Claim 10
Dependent Claim
25 words
The centrifuge rotor of claim 2 or 3, wherein the fiber filament is a material selected from the group consisting of glass, boron, or graphite.
Claim 11
Dependent Claim
84 words
A centrifuge rotor comprising: a body having at least one anisotropic material layer with enhanced strength of material properties in the radial direction; said layer being a disc of radially extending material comprising filament wound fibers bonded by a resinous material; said layer having the fibers which comprise the material of the disc being reoriented so that successive winds of said fiber criss-cross each other to provide additional strength of the material of the disc at selected locations where the greatest stress is anticipated.
Claim 12
Dependent Claim
84 words
A centrifuge rotor comprising: a body having at least one anisotropic material layer with enhanced strength of material properties in the radial direction; said layer being a disc of radially extending material comprising filament wound fibers bonded by a resinous material; said layer having the fibers which comprise the material of the disc being reoriented so that successive winds of said fiber criss-cross each other to provide additional strength of the material of the disc at selected locations where the greatest stress is anticipated.
Claim 13
Dependent Claim
29 words
The centrifuge rotor of claim 10, wherein the filament wound fibers criss-cross each other at a reorientation angle from a horizontal plane over a range of 35° to 55°.
Claim 14
Dependent Claim
21 words
The centrifuge rotor of claim 10, wherein the filament wound fibers criss-cross each other at a reorientation angle of approximately 45°.
References Cited (Backward Citations)
US1827648A
Cited
US2974684A
Cited
US3913828A
Cited
US3997106A
Cited
US3993243A
Cited
US4160521A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |