Patent US3666760A successfully refreshed from Google Patents.
US3666760A
Expired / Lapsed
US
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Iodinated 3-aminobenzamides
Assignee: STWB Inc
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Filing: 1970-04-02
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Granted: 1972-05-30
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Expires: 1990-04-02
Abstract
Abstract 3-Amino-2,4,6-triiodobenzoic acids optionally substituted in the 5-position by amino or carboxy or a derivative thereof 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
- 👤 James H Ackerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:16
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/16; C07D295/18; C07D295/182; C07D295/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
3-Amino-2,4,6-triiodo-5-(N-methylacetamido)-N,N-dimethylbenzamide, according to claim 1 wherein R is N-methylacetamido and Z is dimethylamino.
Claim 2
Dependent Claim
13 words
4-(3-Amino-2,4,6-triiodo-5-(N-methylacetamido)-benzoyl)morpholine, according to Claim 1 wherein R is N-methyl-acetamido and Z is morpholino.
References Cited (Backward Citations)
US3446837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |