Patent US3666800A successfully refreshed from Google Patents.
US3666800A
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US
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Substituted triiodoisophthalamic acids
Assignee: ER Squibb and Sons LLC
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Filing: 1970-06-19
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Granted: 1972-05-30
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Expires: 1990-06-19
Abstract
Abstract WHEREIN R and R2 are hydrogen or alkyl and R'' is alkyl, as well as salts and lower alkyl esters of these compounds are useful as radiopaque agents. Compounds having the formula
Inventors
- 👤 Jack Bernstein
- 👤 Kathryn Alice Losee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:24
CPC Classifications
C; C07; C07C; C07C275/00; C07C275/28; C07C275/42; A; A61; A61K; A61K49/00; A61K49/04; A61K49/0433
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
11 words
A compound of claim 1 wherein R and R2 are hydrogen.
Claim 2
Dependent Claim
11 words
A compound of claim 1 wherein R and R2 are alkyl.
Claim 3
Dependent Claim
13 words
A compound of claim 1 wherein R2 is hydrogen and R is alkyl.
Claim 4
Dependent Claim
13 words
A compound of claim 1 wherein R2 is alkyl and R is hydrogen.
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) | 1975-05-30 | 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 |