Patent US4938284A successfully refreshed from Google Patents.
Patent US3151107A successfully refreshed from Google Patents.
US3151107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble iron complexes of carboxymethyl dextran
Assignee: Central Pharmacal Co
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Filing: 1960-12-22
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Granted: 1964-09-29
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Expires: 1980-12-22
Abstract
No abstract record available.
Inventors
- 👤 Heckel Hermann
- 👤 Everette E Witt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:01
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0009; C08B37/0021; A; A61; A61K; A61K31/00; A61K31/28; A61K31/295; A61K33/00; A61K33/24; A61K33/26; Y; Y10; Y10S; Y10S71/00; Y10S71/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A METHOD OF PREPARING IRON CARBOXYMETHYL DEXTRAN WHICH COMPRISES REACTING AN AQUEOUS ALKALINE SOLUTION OF FERRIC CHLORIDE WITH AN AQUEOUS SOLUTION OF CARBOXYMETHYL DEXTRAN HAVING A D.S. VALUE OF APPROXIMATELY 0.5 AND AN AVERAGE MOLECULAR WEIGHT BETWEEN ABOUT 15,000 AND 25,000, THEREAFTER MAINTAINING THE RESULTANT SOLUTION AT A PH OF 8.5 TO 9.0, AND PRECIPITATING THE IRON SALT OF CARBOXYMETHYL DEXTRAN BY THE ADDITION OF METHANOL, AND FILTERING TO RECOVER THE PRECIPITATE AND WASHING THE SAME WITH ACETONE, AND DRYING THE WASHED PRECIPITATE UNDER VACUUM CONDITIONS AT ABOUT 800*C. TO PRODUCE A WATER-SOLUBLE FREE FLOWING POWDER COMPOSED OF IRON CARBOXYMETHYL DEXTRAN CONTAINING APPROXIMATELY 27% IRON.
Claim 2
Independent Claim
105 words
A METHOD OF PREPARING IRON CARBOXYMETHYL DEXTRAN WHICH COMPRISES REACTING AN AQUEOUS ALKALINE SOLUTION OF FERRIC CHLORIDE WITH AN AQUEOUS SOLUTION OF CARBOXYMETHYL DEXTRAN HAVING A D.S. VALUE OF APPROXIMATELY 0.5 AND AN AVERAGE MOLECULAR WEIGHT BETWEEN ABOUT 15,000 AND 25,000, THEREAFTER MAINTAINING THE RESULTANT SOLUTION AT A PH OF 8.5 TO 9.0, AND PRECIPITATING THE IRON SALT OF CARBOXYMETHYL DEXTRAN BY THE ADDITION OF METHANOL, AND FILTERING TO RECOVER THE PRECIPITATE AND WASHING THE SAME WITH ACETONE, AND DRYING THE WASHED PRECIPITATE UNDER VACUUM CONDITIONS AT ABOUT 800*C. TO PRODUCE A WATER-SOLUBLE FREE FLOWING POWDER COMPOSED OF IRON CARBOXYMETHYL DEXTRAN CONTAINING APPROXIMATELY 27% IRON.
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) | 1967-09-29 | 1968-03-30 | 1968-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-29 | 1972-03-30 | 1972-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-29 | 1976-03-30 | 1976-09-29 | $7700.00 | Window Closed / Lapsed |