Patent US3724747A successfully refreshed from Google Patents.
US3724747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifuge apparatus with means for moving material
Assignee: Linde Sverige AB
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Filing: 1972-03-10
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Granted: 1973-04-03
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Expires: 1992-03-10
Abstract
Abstract A centrifuge for batch treatment of a liquid, particularly blood, such as for separating blood into fractions of different densities and/or for washing blood cells suspended in a liquid, comprises closed collapsible containers in the centrifuge rotor. Resilient tubing interconnects the containers and a peristaltic pump member mounted on and rotating with the centrifuge rotor acts on the resilient tubing to selectively move liquid therethrough from one container to another and prevent liquid flow through the resilient tubing.
Inventors
- 👤 H Unger
- 👤 E Westberg
- 👤 S Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:18
CPC Classifications
B; B04; B04B; B04B5/00; B04B5/04; B04B5/0407; B04B5/0428; B04B5/0442; B04B2005/045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
117 words
A centrifuge for separating liquid into fractions of different densities, comprising a centrifuge rotor, a plurality of collapsible closed containers disposed in the centrifuge rotor for rotation therewith, a first one of the containers being adapted to initially hold a discrete quantity of liquid to be treated in the rotor and a second one being adapted to receive a fraction of lesser density from said first container, collapsible conduit means defining a flow path for conveying liquid between said first and second containers, and peristaltic pump means mounted on the centrifuge rotor for rotation therewith and acting on the conduit means to selectively move lIquid through the conduit means and prevent liquid flow through the conduit means.
Claim 2
Dependent Claim
117 words
A centrifuge for separating liquid into fractions of different densities, comprising a centrifuge rotor, a plurality of collapsible closed containers disposed in the centrifuge rotor for rotation therewith, a first one of the containers being adapted to initially hold a discrete quantity of liquid to be treated in the rotor and a second one being adapted to receive a fraction of lesser density from said first container, collapsible conduit means defining a flow path for conveying liquid between said first and second containers, and peristaltic pump means mounted on the centrifuge rotor for rotation therewith and acting on the conduit means to selectively move lIquid through the conduit means and prevent liquid flow through the conduit means.
Claim 3
Dependent Claim
53 words
A centrifuge as set forth in claim 1 in which the peristaltic pump means includes pump rotor means mounted for rotation with respect to the centrifuge rotor about the axis of rotation of the latter and selectively operable means for causing rotation of the pump rotor means with respect to the centrifuge rotor.
Claim 4
Dependent Claim
61 words
A centrifuge as set forth in claim 2 in which the pump rotor means comprises two concentric rotors which are independently rotatable with respect to the centrifuge rotor, one of said rotors acting on a first collapsible conduit for transferring liquid to the first container and the other acting on a second collapsible conduit for transferring liquid from the first container.
Claim 5
Dependent Claim
74 words
A centrifuge as set forth in claim 1 in which the containers are generally circular and disk shaped containers which are disposed one on the other and concentric with the axis of rotation of the centrifuge rotor and in which a resilient member is disposed in the centrifuge rotor to apply during rotation of the latter an external pressure to the containers which is proportional to the speed of rotation of the centrifuge rotor.
Claim 6
Dependent Claim
34 words
A centrifuge as set forth in claim 4 in which the resilient member is made of a soft material adapted to have a specific gravity higher than that of the liquid to be treated.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |