Patent US3508195A successfully refreshed from Google Patents.
US3228838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preservation of biological substances
Assignee: Union Carbide Corp
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Filing: 1959-04-23
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Granted: 1966-01-11
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Expires: 1979-04-23
Abstract
No abstract record available.
Inventors
- 👤 Arthur P Rinfret
- 👤 Clement W Cowley
- 👤 William J Timson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:43
CPC Classifications
A; A23; A23L; A23L2/00; A23L2/02; A23L2/08; A23L2/12; A23L2/14; A01; A01N; A01N1/00; A01N1/10; A01N1/12; A01N1/122; A01N1/125; A01N1/14; A01N1/142; A01N1/144; A01N1/16; A01N1/162; A23B; A23B2/00; A23B2/80; A23B2/803; A61; A61L; A61L2/00; A61L2/02; C; C12; C12N; C12N1/00; C12N1/04; F; F25; F25C; F25C1/00; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/831; Y10S435/848; Y10S435/849; Y10S435/859
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A PROCESS FOR TREATING BLOOD WHICH COMPRISES THE STEPS OF COLLECTING THE BLOOD IN AN ANTI-COAGULANT MEDIUM, ADDING A PROTECTIVE ADITIVE, STORING THE BLOOD-ADDITIVE MIXTURE AT A TEMPERATURE OF ABOUT 4*C. FOR AT LEAST ONE HOUR, INTRODUCING DROPLETS OF SAID BLOOD-ADDITIVE MIXTURE INTO A MOVING FILM OF NITROGEN WHEREBY SAID DROPLETS ARE QUICK-FROZEN, SAID DROPLETS HAVING A SIZE RANGING BETWEEN .25 MM. AND 2.0 MM. IN DIAMETER, SAID FILM OF LIQUID NITROGEN HAVING ADEPTH OF AT LEAST ABOUT 1/8 INCH AND SAID FILM OF LIQUID NOTROGEN MOVING AT A RATE OF ABOUT AT LEAST 26 MM. PER SECOND; STORING SAID FROZEN DROPLETS IN LIQUID NITROGEN AT A TEMPERATURE OF BELOW ABOUT -130*C. AND THEREAFTER INTRODUCING THE FROZEN DROPLETS INTO A MOVING AQUEOUS BATH OF POLYVINYLPYRROLIDONE AND NAC1 WHEREBY SAID FROZEN DROPLETS ARE THAWED, SAID BATH BEING MAINTAINED AT A CONSTANT TEMPERATURE.
Claim 2
Dependent Claim
141 words
A PROCESS FOR TREATING BLOOD WHICH COMPRISES THE STEPS OF COLLECTING THE BLOOD IN AN ANTI-COAGULANT MEDIUM, ADDING A PROTECTIVE ADITIVE, STORING THE BLOOD-ADDITIVE MIXTURE AT A TEMPERATURE OF ABOUT 4*C. FOR AT LEAST ONE HOUR, INTRODUCING DROPLETS OF SAID BLOOD-ADDITIVE MIXTURE INTO A MOVING FILM OF NITROGEN WHEREBY SAID DROPLETS ARE QUICK-FROZEN, SAID DROPLETS HAVING A SIZE RANGING BETWEEN .25 MM. AND 2.0 MM. IN DIAMETER, SAID FILM OF LIQUID NITROGEN HAVING ADEPTH OF AT LEAST ABOUT 1/8 INCH AND SAID FILM OF LIQUID NOTROGEN MOVING AT A RATE OF ABOUT AT LEAST 26 MM. PER SECOND; STORING SAID FROZEN DROPLETS IN LIQUID NITROGEN AT A TEMPERATURE OF BELOW ABOUT -130*C. AND THEREAFTER INTRODUCING THE FROZEN DROPLETS INTO A MOVING AQUEOUS BATH OF POLYVINYLPYRROLIDONE AND NAC1 WHEREBY SAID FROZEN DROPLETS ARE THAWED, SAID BATH BEING MAINTAINED AT A CONSTANT TEMPERATURE.
References Cited (Backward Citations)
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US2396561A
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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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |