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Patent US4172803A successfully refreshed from Google Patents.
US4172803A
Expired / Lapsed
US
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Liquid separating composition and apparatus for applying said composition
Assignee: Terumo Corp
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Filing: 1977-10-20
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Granted: 1979-10-30
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Expires: 1997-10-20
Abstract
Abstract This invention provides a liquid separating composition containing as a base material a liquid polymer of hydrocarbon or derivatives thereof having a viscosity ranging from 100 to 20,000 CP at 20° C., suitable amounts of additives for adjusting the specific gravity and viscosity of the composition and a network former for imparting a thixotropic property to the composition. This invention also provides an apparatus for applying a liquid separating composition, comprising a vessel filled with a liquid separating composition, and a cannula fixed to the vessel, for piercing into a rubber cap of a liquid container. The liquid separating composition is transferred to the liquid container by centrifuging the apparatus connected to the liquid container.
Inventors
- 👤 Toshizi Ichikawa
- 👤 Teruko Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:16
CPC Classifications
B; B01; B01D; B01D43/00; G; G01; G01N; G01N33/00; G01N33/48; G01N33/483; G01N33/487; G01N33/49; G01N33/491; Y; Y10; Y10T; Y10T436/00; Y10T436/10; Y10T436/107497; Y10T436/25; Y10T436/25375
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
A thixotropic blood-separating composition having a specific gravity ranging from about 1.030 to about 1.065 and a viscosity ranging from about 300,000 to about 2,500,000 CP at 20° C. and comprising as a base material, a liquid polymer having a viscosity of from about 100 to about 20,000 CP at 20° C. selected from the group consisting of liquid polybutadiene, liquid epoxidized polybutadiene, and liquid maleinized polybutadiene and a suitable amount of an additive for adjusting the specific gravity and the viscosity of the composition to the above ranges and a thixotropic property-imparting amount of a network former.
Claim 2
Dependent Claim
98 words
A thixotropic blood-separating composition having a specific gravity ranging from about 1.030 to about 1.065 and a viscosity ranging from about 300,000 to about 2,500,000 CP at 20° C. and comprising as a base material, a liquid polymer having a viscosity of from about 100 to about 20,000 CP at 20° C. selected from the group consisting of liquid polybutadiene, liquid epoxidized polybutadiene, and liquid maleinized polybutadiene and a suitable amount of an additive for adjusting the specific gravity and the viscosity of the composition to the above ranges and a thixotropic property-imparting amount of a network former.
Claim 3
Dependent Claim
15 words
The blood-separating composition according to claim 1, wherein the liquid polymer is liquid, epoxidized cis-polybutadiene.
Claim 4
Dependent Claim
14 words
The blood-separating composition according to claim 1, wherein the additive is fine silica powder.
Claim 5
Dependent Claim
23 words
The blood-separating composition according to claim 1, wherein the additive is selected from the group consisting of alumina, nylon and barium sulfate powders.
Claim 6
Dependent Claim
35 words
The blood-separating composition according to claim 1, wherein the network former is selected from the group consisting of diethylene glycol, trimethylene glycol, a glycol-siloxane copolymer, and di-benzal sorbitol dispersed in an aromatic or aliphatic diester.
Claim 7
Dependent Claim
32 words
The blood-separating composition according to claim 1, wherein the liquid polymer is epoxidized cis-polybutadiene, the gravity and viscosity adjusting additive is hydrophobic fine silica powder, and the network former is trimethylene glycol.
Claim 8
Dependent Claim
14 words
The blood-separating composition of claim 1, wherein the liquid polymer is liquid epoxidized polybutadiene.
References Cited (Backward Citations)
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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) | 1982-10-29 | 1983-04-30 | 1983-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-29 | 1987-04-30 | 1987-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-29 | 1991-04-30 | 1991-10-30 | $7700.00 | Window Closed / Lapsed |