US4056484A
Expired / Lapsed
US
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Stable blood plasma, process for preparing it and its use as comparative plasma in coagulation tests
Assignee: Siemens Healthcare Diagnostics GmbH Germany
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Filing: 1975-12-29
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Granted: 1977-11-01
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Expires: 1995-12-29
Abstract
Abstract Lyophilized blood plasma under a protective gas wherein the protective gas contains at least 5% of carbon dioxide.
Inventors
- 👤 Norbert Heimburger
- 👤 Axel Sieber
- 👤 Horst Schwinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:01
CPC Classifications
F; F26; F26B; F26B5/00; F26B5/04; F26B5/06; A; A01; A01N; A01N1/00; A01N1/10; A01N1/12; A01N1/122; A01N1/125; A61; A61K; A61K35/00; A61K35/12; A61K35/14; A61K35/16; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/96; G01N2496/00; G01N2496/05; Y; Y10; Y10T; Y10T436/00; Y10T436/10; Y10T436/106664; Y10T436/107497; Y10T436/108331
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
25 words
Lyophilized blood plasma containing an anti-coagulating agent and present in a sealed container under a protective gas containing at least 5 percent of carbon dioxide.
Claim 2
Dependent Claim
25 words
Lyophilized blood plasma containing an anti-coagulating agent and present in a sealed container under a protective gas containing at least 5 percent of carbon dioxide.
Claim 3
Dependent Claim
13 words
Lyophilized blood plasma as in claim 1 which additionally contains a colloid-stabilizing additive.
Claim 4
Dependent Claim
68 words
A method for making lyophilized blood plasma as in claim 1, which method comprises mixing fresh blood with an anticoagulating agent, centrifuging said mixture and separating the plasma component thereof, filling said plasma into a non-wettable container, freezing said plasma to form frozen plasma having a large surface area, lyophilizing said frozen plasma, evacuating said container, introducing said protective gas into said container, and then sealing said container.
Claim 5
Dependent Claim
54 words
In a method for determining a component of blood plasma by observing the coagulation behavior of a plasma sample to be tested and comparing this behavior with the coagulation behavior of a plasma of known characteristics, the improvement wherein said plasma of known characteristics is prepared from lyophilized blood plasma as in claim 1.
References Cited (Backward Citations)
US3466249A
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US3629142A
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US3682835A
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US3876375A
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US3876375B1
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US3897363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |