US4449966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifuge rotor balancing bosses
Assignee: Beckman Coulter Inc
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Filing: 1982-07-19
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Granted: 1984-05-22
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Expires: 2002-07-19
Abstract
Abstract Balancing bosses integrally forged in a centrifuge rotor. The plurality of balancing bosses in the rotor establish noncritical areas in the rotor for machining to accomplish the precise balancing necessary for high speed ultracentrifugation. The balancing bosses are located away from the high stress periphery of the rotor so that machining a portion of the bosses for balancing purposes will not degrade the integral strength of the rotor.
Inventors
- 👤 Alireza Piramoon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:44
CPC Classifications
B; B04; B04B; B04B9/00; B04B9/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
A centrifuge rotor comprising: a central post; a plurality of arms extending out from said central post; a support ring connected to the outer ends of said arms, said ring being the highest stress area in said rotor during centrifugation means within said rotor for holding fluid samples; and a plurality of projecting bosses located on said arms, said bosses being selectably machined to establish perfect balance of said rotor when it rotates on said spin axis.
Claim 2
Dependent Claim
77 words
A centrifuge rotor comprising: a central post; a plurality of arms extending out from said central post; a support ring connected to the outer ends of said arms, said ring being the highest stress area in said rotor during centrifugation means within said rotor for holding fluid samples; and a plurality of projecting bosses located on said arms, said bosses being selectably machined to establish perfect balance of said rotor when it rotates on said spin axis.
Claim 3
Dependent Claim
34 words
A centrifuge rotor as defined in claim 2, wherein said holding means comprises a plurality of containers pivotally mounted between adjacent arms, said containers contacting and being supported by said support ring during centrifugation.
Claim 4
Dependent Claim
82 words
A centrifuge rotor comprising: a central post aligned with the spin axis of the rotor; a plurality of support arms extending radially outward from said central post; a support ring surrounding and attached to said arms, said ring with said arms forming recesses for receipt of fluid sample containers; and a plurality of selectively machinable bosses integrally formed in said rotor between said ring and said central post, the size of said bosses determining the proper balance of said rotor during centrifugation.
Claim 5
Dependent Claim
82 words
A centrifuge rotor comprising: a central post aligned with the spin axis of the rotor; a plurality of support arms extending radially outward from said central post; a support ring surrounding and attached to said arms, said ring with said arms forming recesses for receipt of fluid sample containers; and a plurality of selectively machinable bosses integrally formed in said rotor between said ring and said central post, the size of said bosses determining the proper balance of said rotor during centrifugation.
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) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |