US3647864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
5-substituted-1 3-benzenediacrylic and -dipropionic acids
Assignee: STWB Inc
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Filing: 1967-11-16
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Granted: 1972-03-07
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Expires: 1987-11-16
Abstract
Abstract 5-AMINO-OR 5-HYDROXY-2,4,6-TRIIODO-1,3-BENZENDIACRYLIC AND-DIPROPIONIC ACIDS, OPTIONALLY SUBSTITUTED BY LOWER-ALKYL OR PHENYL IN THE A- AND A''-POSITIONS, ARE PREPARED BY IODINATION OF THE APPROPRIATE 5-AMINO- OR 5 HYDROXYL-1,3-BENEZENEDIACRYLIC OR -DIPROPIONIC ACIDS; AND THE 5-AMINO AND 5-HYDROXY GROUPS ARE FURTHER SUBSTITUTED BY ACYL AND ALKYL GROUPS. THE IODINATED COMPOUNDS ARE USEFUL AS INTRAVENOUS CHLECYSTOGRAPHIC AGENTS.
Inventors
- 👤 James H Ackerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:52
CPC Classifications
C; C07; C07C; C07C59/00; C07C59/40; C07C59/42; C07C59/56; A; A61; A61K; A61K49/00; A61K49/04; A61K49/0433; C07C205/00; C07C205/49; C07C205/56
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |