US3770820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iodinated anilic acids
Assignee: Individual
•
Filing: 1971-01-25
•
Granted: 1973-11-06
•
Expires: 1991-01-25
Abstract
Abstract 3-AMINO-2,4,6-TRIIODOBENZOIC ACIDS OPTIONALLY SUBSTITUTED IN THE 5-POSITION BY AMINO OR CARBOXY OR A DERIVATIVE THEROF REACT WITH DIBASIC ACID ANHYDRIDES TO GIVE THE CORRESPONDING CYCLIC IMIDES (A), WHICH CAN BE HYDROLYZED TO THE CORRESPONDING ANILIC ACIDS (B). THE LATTER CAN BE FURTHER ALKYLATED ON THE ANILIDE NITROGEN ATOM. COMPOUNDS A AND B ARE USEFUL AS CHOLECYSTOGRAPHIC AND UROGRAPHIC AGENTS.
Inventors
- 👤 J Ackerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:39
CPC Classifications
C; C07; C07D; C07D211/00; C07D211/04; C07D211/80; C07D211/84; C07D211/86; C07D211/88; C07D207/00; C07D207/02; C07D207/30; C07D207/34; C07D207/36; C07D207/40; C07D265/00; C07D265/28; C07D265/30; C07D265/32; C07D279/00; C07D279/10; C07D279/12
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |