US3702821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Serum thyroxine anion exchange resin
Assignee: BIO CHEM PROCEDURES Inc
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Filing: 1970-12-14
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Granted: 1972-11-14
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Expires: 1990-12-14
Abstract
Abstract BY PRETREATMENT OF A STRONG BASE QUATERNARY AMMONIUM ANION EXCHANGE RESIN WITH AN AQUEOUS SOLUTION OF A CHELATING AGENT, MORE EFFICIENT ELUTION OF THYROXINE THEREFROM IN BIOLOGICAL ISOLATION AND ANALYTICAL PROCEDURES IS ACHIEVED. A FURTHER IMPROVEMENT IS ACHIEVED BY PRETREATMENT OF THE RESIN WITH NITRIC ACID.
Inventors
- 👤 Alberto Antonio Fernandez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:04
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/74; G01N33/78; B; B01; B01J; B01J41/00; B01J41/04; B01J41/05; B01J47/00; B01J47/016; Y; Y10; Y10T; Y10T436/00; Y10T436/10; Y10T436/106664; Y10T436/25; Y10T436/25375
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |