US3734953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tris-triiodoisophthalamic acids and derivatives
Assignee: ER Squibb and Sons LLC
•
Filing: 1969-08-11
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Granted: 1973-05-22
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Expires: 1989-08-11
Abstract
Abstract THIS INVENTION RELATES TO NEW TRIS-TRIIODOISOPHTHALAMIC ACID COMPOUNDS HAVING THE FORMULA (Z-CO-NH-(2,4,6-TRI(I-),5-(HOOC-)-1,3-PHENYLENE)-CO-NH- (CH2)N)3-N WHEREIN Z IS AN ALKYL CHAIN OF UP TO 6 CARBON ATOMS, OR A RADICAL OF THE FORMULA -N(-R'')-R" WHEREIN R'' IS AN ALKYL CHAIN OFUP TO 6 CARBON ATOMS, AND R" IS HYDROGEN OR AN ALKYL CHAIN OF UP TO 6 CARBON ATOMS, N IS AN INTEGER FROM 2 TO 4, AND TO SALTS AND LOWER ALKYL ESTERS OF THESE COMPOUNDS. THESE COMPOUND ARE USEFUL AS RADIOPAQUE AGENTS.
Inventors
- 👤 J Bernstein
- 👤 K Losee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:20
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |