Patent US3170838A successfully refreshed from Google Patents.
US3170838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugation of whole blood to separate eosinophils
Assignee: National Research Development Corp UK
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Filing: 1961-05-22
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Granted: 1965-02-23
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Expires: 1981-05-22
Abstract
No abstract record available.
Inventors
- 👤 Archer Richard Kendray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:38
CPC Classifications
A; A61; A61K; A61K35/00; A61K35/12; A61K35/14; A61K35/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
PROCESS FOR PRODUCING AN AQUEOUS PREPARATION OF EOSINOPHILS WHICH COMPRISES REMOVING FROM EOSINOPHILRICH MAMMALIAN BLOOD THE BULK OF THE ERYTHROCYTES THEREIN, CENTRIFUGING THE RESIDUAL BLOOD, DISCARDING THE LIGHTER BLOOD FRACTIONS UP TO AN INCLUDING THE BUFFY COAT LAYER, SUBJECTING THE HEAVIER REMAINING FRACTION TO TREATMENT IN AN AQUEOUS MEDIUM TO CAUSE SELECTIVE LYSIS OF ERYTHROCYTES PRESENT IN SAID HEAVIER FRACTION, CENTRIFUGING THE RESULTANT MATERIAL TO REMOVE CELL DEBRIS ARISING FROM SAID SELECTIVE LYSIS, AND REMOVING THE AQUEOUS PREPARATION OF EOSINOPHILS SO OBTAINED.
Claim 2
Dependent Claim
82 words
PROCESS FOR PRODUCING AN AQUEOUS PREPARATION OF EOSINOPHILS WHICH COMPRISES REMOVING FROM EOSINOPHILRICH MAMMALIAN BLOOD THE BULK OF THE ERYTHROCYTES THEREIN, CENTRIFUGING THE RESIDUAL BLOOD, DISCARDING THE LIGHTER BLOOD FRACTIONS UP TO AN INCLUDING THE BUFFY COAT LAYER, SUBJECTING THE HEAVIER REMAINING FRACTION TO TREATMENT IN AN AQUEOUS MEDIUM TO CAUSE SELECTIVE LYSIS OF ERYTHROCYTES PRESENT IN SAID HEAVIER FRACTION, CENTRIFUGING THE RESULTANT MATERIAL TO REMOVE CELL DEBRIS ARISING FROM SAID SELECTIVE LYSIS, AND REMOVING THE AQUEOUS PREPARATION OF EOSINOPHILS SO OBTAINED.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |