Patent US2483742A successfully refreshed from Google Patents.
Patent US2907789A successfully refreshed from Google Patents.
US2907789A
Expired / Lapsed
US
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Process for the production of water-soluble anti-thrombotic organic salt preparations
Assignee: HELOPHARM PETRIK CO KG
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Filing: 1956-12-07
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Granted: 1959-10-06
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Expires: 1976-12-07
Abstract
No abstract record available.
Inventors
- 👤 Kreis Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:13
CPC Classifications
A; A61; A61K; A61K33/00; A61K33/14; C; C07; C07C; C07C59/00; C07C59/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A METHOD OF MANUFACTURING AN ANTI-COAGULANT COMPRISING THE STEPS OF ADDING LEVULINIC ACID TO AN AQUEOUS SOLUTION OF A RARE EARTH SALT SELECTED FROM THE GROUP CONSISTING OF DIDYMIUM CARBONATE, DIDYMIUM HYDROXIDE, NEODYMIUM CARBONATE, NEODYMIUM HYDROXIDE, PRASEODYMIUM CARBONATE, PRASEODYMIUM HYDROXIDE, HEATING THE SOLUTION, REGULATING THE PH OF THE HEATED SOLUTION TO A PH OF SUBSTANTIALLY 6.0 BY THE ADDITION OF ACID, FILTERING SAID SOLUTION, AND THEN EVAPORATING THE WATER IN SAID SOLUTION TO OBTAIN THE RARE EARTH SALT OF LEVULINIC ACID.
Claim 2
Independent Claim
81 words
A METHOD OF MANUFACTURING AN ANTI-COAGULANT COMPRISING THE STEPS OF ADDING LEVULINIC ACID TO AN AQUEOUS SOLUTION OF A RARE EARTH SALT SELECTED FROM THE GROUP CONSISTING OF DIDYMIUM CARBONATE, DIDYMIUM HYDROXIDE, NEODYMIUM CARBONATE, NEODYMIUM HYDROXIDE, PRASEODYMIUM CARBONATE, PRASEODYMIUM HYDROXIDE, HEATING THE SOLUTION, REGULATING THE PH OF THE HEATED SOLUTION TO A PH OF SUBSTANTIALLY 6.0 BY THE ADDITION OF ACID, FILTERING SAID SOLUTION, AND THEN EVAPORATING THE WATER IN SAID SOLUTION TO OBTAIN THE RARE EARTH SALT OF LEVULINIC ACID.
References Cited (Backward Citations)
GB633370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-05 | 1963-04-06 | 1963-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-05 | 1967-04-06 | 1967-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-05 | 1971-04-06 | 1971-10-06 | $7700.00 | Window Closed / Lapsed |