US4649120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for reducing turbidity in control sera
Assignee: Siemens Healthcare Diagnostics GmbH Germany
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Filing: 1984-08-17
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Granted: 1987-03-10
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Expires: 2004-08-17
Abstract
Abstract A process for reducing turbidity in a dried and redissolved control serum and a dried and reconstituted control serum with reduced turbidity are described. The process can also be applied to control sera for lipid determination, and in particular also to those with an increased lipid content.
Inventors
- 👤 Dagmar Steuer
- 👤 Rudolf Schmidtberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:40
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/96; G01N2496/00; G01N2496/05; G01N33/92; Y; Y10; Y10T; Y10T436/00; Y10T436/10; Y10T436/104165; Y10T436/106664
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
53 words
A process for reducing turbidity in a dried and reconstituted control serum, which comprises adding proline and Na deoxycholate to the control serum before drying wherein the concentration of the proline in the liquid control serum is 5-100 g/liter and the concentration of Na deoxycholate in the liquid control serum is 0.5-5 g/liter.
Claim 2
Dependent Claim
53 words
A process for reducing turbidity in a dried and reconstituted control serum, which comprises adding proline and Na deoxycholate to the control serum before drying wherein the concentration of the proline in the liquid control serum is 5-100 g/liter and the concentration of Na deoxycholate in the liquid control serum is 0.5-5 g/liter.
Claim 3
Dependent Claim
29 words
The process as claimed in claim 1, wherein the concentration of sodium in the liquid control serum is 40-80 mmols/liter and that of the chloride ions is 20-70 mmols/liter.
Claim 4
Dependent Claim
44 words
A control serum in dry form, which contains proline and Na deoxycholate wherein the concentration of the proline in the liquid control serum before drying is 5-100 g/liter and the concentration of Na deoxycholate in the liquid control serum before drying is 0.5-5 g/liter.
Claim 5
Dependent Claim
44 words
A control serum in dry form, which contains proline and Na deoxycholate wherein the concentration of the proline in the liquid control serum before drying is 5-100 g/liter and the concentration of Na deoxycholate in the liquid control serum before drying is 0.5-5 g/liter.
References Cited (Backward Citations)
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US4324685A
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US4299726A
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US4363633A
Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |