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US4160644A
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Platelet reference control and method of preparation
Assignee: Streck Inc
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Filing: 1977-06-13
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Granted: 1979-07-10
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Expires: 1997-06-13
Abstract
Abstract A platelet reference control and method of preparation in which a minor amount of solid polyethylene glycol is added either to the platelet suspension or the diluent for the platelet suspension whereby time and agitation stabilization are both achieved.
Inventors
- 👤 Wayne L. Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:27
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/96; G01N2496/00; G01N2496/05; Y; Y10; Y10T; Y10T436/00; Y10T436/10; Y10T436/101666; Y10T436/107497; Y10T436/108331
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A method of preparing a fixed platelet reference control comprising the steps of stabilizing a fixed platelet reference control against false counts due to container adsorption by adding a solid polyethylene glycol as a stabilizing agent to one member selected from the two member class consisting of an aldehyde fixed platelet suspension member and an isotonic diluent member for a platelet suspension, and thereafter adding the other member to the mixture resulting from the first adding step whereby a control is achieved that is substantially time and agitation stable.
Claim 2
Independent Claim
89 words
A method of preparing a fixed platelet reference control comprising the steps of stabilizing a fixed platelet reference control against false counts due to container adsorption by adding a solid polyethylene glycol as a stabilizing agent to one member selected from the two member class consisting of an aldehyde fixed platelet suspension member and an isotonic diluent member for a platelet suspension, and thereafter adding the other member to the mixture resulting from the first adding step whereby a control is achieved that is substantially time and agitation stable.
Claim 3
Dependent Claim
22 words
The method of claim 1 in which the polyethylene glycol is first added to the suspension and the diluent mixed in thereafter.
Claim 4
Dependent Claim
20 words
The method of claim 2 in which about 10-20 grams of polyethylene glycol are added for 100 ml of suspension.
Claim 5
Dependent Claim
21 words
The method of claim 1 in which the polyethylene glycol is added to the diluent and the suspension mixed in thereafter.
Claim 6
Dependent Claim
22 words
The method of claim 4 in which about 0.1 to about 0.5 grams of polyethylene glycol are added per liter of diluent.
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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) | 1982-07-09 | 1983-01-08 | 1983-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-09 | 1987-01-08 | 1987-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-09 | 1991-01-08 | 1991-07-10 | $7700.00 | Window Closed / Lapsed |