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US3660469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bis-triiodoisophthalamic acid compounds
Assignee: ER Squibb and Sons LLC
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Filing: 1969-08-04
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Granted: 1972-05-02
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Expires: 1989-08-04
Abstract
Abstract THIS INVENTION RELATES TO NEW BIS-TRIIODOISOPHTHALAMIC ACID COMPOUNDS HAVING THE FORMULA 1-((2,4,6-TRI(I-),2-(R2-N(-R3)-CO-HN-),5-(HOOC-)PHENYL)- CO-N(-R1)-CH(-R1)-(C(-R)2)N-CH(-R1)-N(-R1)-CO-),2,4,6- TRI(I-),3-(R2-N(-R3)-CO-HN-),5-(HOOC-)BENZENE AND TO SALTS AND LOWER ALKYL ESTERS OF THESE COMPOUNDS. THESE COMPOUNDS ARE USEFUL AS RADIOPAQUE AGENTS.
Inventors
- 👤 Jack Bernstein
- 👤 Kathryn A Losee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:33
CPC Classifications
C; C07; C07C; C07C275/00; C07C275/28; C07C275/42
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |