US3953497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2,4,6-Triiodo-5-methoxyacetamido-N-methylisophthalamic acid and salts, acyl halides and esters thereof
Assignee: Mallinckrodt Inc
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Filing: 1974-07-29
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Granted: 1976-04-27
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Expires: 1994-07-29
Abstract
Abstract 2,4,6-Triiodo-5-methoxyacetamido-N-methylisophthalamic acid and salts and esters thereof are useful as x-ray contrast agents. The corresponding acyl halides are useful as intermediates.
Inventors
- 👤 Philip E. Wiegert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:24
CPC Classifications
A; A61; A61K; A61K49/00; A61K49/04; A61K49/0433
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
29 words
A compound selected from the group consisting of 2,4,6-triiodo-5-methoxyacetamido-N-methylisophthalamic acid, the ammonium salt thereof, salts thereof with pharmaceutically acceptable cations, lower alkyl esters thereof, and the acyl halide thereof.
Claim 2
Dependent Claim
29 words
A compound selected from the group consisting of 2,4,6-triiodo-5-methoxyacetamido-N-methylisophthalamic acid, the ammonium salt thereof, salts thereof with pharmaceutically acceptable cations, lower alkyl esters thereof, and the acyl halide thereof.
Claim 3
Dependent Claim
11 words
A compound as defined by claim 1 which is 2,4,6-triiodo-5-methoxyacetamido-N-methylisophthalamic acid.
Claim 4
Dependent Claim
19 words
A compound as defined by claim 1 which is a salt of 2,4,6-triiodo-5-methoxyacetamido-N-methylisophthalamic acid with a pharmaceutically acceptable cation.
Claim 5
Dependent Claim
14 words
A compound as defined by claim 3 wherein the pharmaceutically acceptable cation is sodium.
Claim 6
Dependent Claim
14 words
A compound as defined by claim 3 wherein the pharmaceutically acceptable cation is meglumine.
Claim 7
Dependent Claim
11 words
A compound as defined by claim 1 which is 2,4,6-triiodo-5-methoxyacetamido-N-methylisophthalamoyl chloride.
Claim 8
Dependent Claim
11 words
A compound as defined by claim 1 which is ethyl 2,4,6-triiodo-5-methoxyacetamido-N-methylisophthalamate.
References Cited (Backward Citations)
US3666800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |