Patent US3883578A successfully refreshed from Google Patents.
US3883578A
Expired / Lapsed
US
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Radiopaque agents
Assignee: Bayer Pharma AG
•
Filing: 1971-09-29
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Granted: 1975-05-13
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Expires: 1991-09-29
Abstract
Abstract Compounds of the formula WHEREIN R1 is H, I, an amino or an amido group; R2 is H or lower-alkyl and X is a C-C single bond, a bridging hydrocarbon group or a group of the formula WHEREIN Y is lower-hydrocarbon, are radiopaque agents useful, e.g., in myelography and bronchography.
Inventors
- 👤 Heinz Gries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:18
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/263; C07D207/27; A; A61; A61K; A61K49/00; A61K49/04; A61K49/0433
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
4 words
COMPOUNDS OF THE FORMULA
Claim 2
Dependent Claim
4 words
COMPOUNDS OF THE FORMULA
Claim 3
Dependent Claim
10 words
A compound according to claim 1, wherein X is ethylene.
Claim 4
Dependent Claim
17 words
A compound according to claim 1, in the form of a sodium salt or a hydrochloride salt.
Claim 5
Dependent Claim
17 words
A compound according to claim 1, wherein R1 is H, -NHCH3, mono-lower-alkanoyl-amino, N-lower-alkyl-lower-alkanoyl-amino, di-lower alkanoyl-amino or lower-alkanoyl-aminomethyl.
Claim 6
Dependent Claim
15 words
A compound accordinng to claim 1, wherein R1 is H, -CONHCH3, -N(CH3)COCH3, -CH2NHCOCH3 or -NHCOCH3.
Claim 7
Dependent Claim
13 words
A compound according to claim 1, wherein R2 is H, CH3 or C2H5.
Claim 8
Dependent Claim
13 words
A compound according to claim 5, wherein R2 is H, CH3 or C2H5.
Claim 9
Dependent Claim
7 words
A compound of claim 1, 3-methylamino-2,4,6-triiodobenzoic acid.
Claim 10
Dependent Claim
8 words
A compound of claim 1, 3-methylamino-5-methylaminocarbonyl-2, 4,6-triiodobenzoic acid.
Claim 11
Dependent Claim
7 words
A compound of claim 1, 3-methylamino-5-N-methylacetylamino-2,4,6-triiodobenzoic acid.
Claim 12
Dependent Claim
8 words
A compound of claim 1, 3-methylamino-5-acetylaminomethyl-2, 4,6-triiodobenzoic acid.
Claim 13
Dependent Claim
12 words
A compound of claim 1, the sodium salt of Beta -(3-methylamino-2,4,6-triiodophenyl)propionic acid.
Claim 14
Dependent Claim
8 words
A compound of claim 1, Beta -(3-methylamino-2,4,6-triiodophenyl)propionic acid.
Claim 15
Dependent Claim
9 words
A compound of claim 1, Beta -(3-methylamino-2,4,6-triiodophenyl)propionic acid hydrochloride.
Claim 16
Dependent Claim
12 words
A compound of claim 1, the methyl ester of Beta -(3-methylamino-2,4,6-triiodophenyl)propionic acid.
Claim 17
Dependent Claim
10 words
A compound of claim 1, Alpha -ethyl- Beta -(3-methylamino-2,4,6-triiodophenyl)propionic acid.
Claim 18
Dependent Claim
7 words
A compound of claim 1, N,N''-dimethyl-3,5-diamino-2,4,6-triiodobenzoic acid.
Claim 19
Dependent Claim
7 words
A compound of claim 1, 3-methylamino-5-acetylamino-2,4,6-triiodobenzoic acid.
Claim 20
Dependent Claim
12 words
A compound of claim 1, the methyl ester of 3-methylamino-2, 4,6-tyriiodobenzoic acid.
Claim 21
Dependent Claim
12 words
A compound of claim 1, the ethyl ester of 3-methylamino-2,4, 6-triiodobenzoic acid.
Claim 22
Dependent Claim
18 words
A process for preparing a compound according to claim 1, which comprises reacting a compound of the formula
Claim 23
Dependent Claim
23 words
A process according to claim 21, wherein R2 is lower alkyl, further comprising saponifying the resultant ester to form a corresponding acid salt.
Claim 24
Dependent Claim
23 words
A process according to claim 21, wherein R2 is hydrogen, further comprising esterifying the carboxyl group to form a lower alkyl ester thereof.
Claim 25
Dependent Claim
20 words
A process according to claim 21, further comprising converting the resultant product into a pharmaceutically acceptable acid addition salt thereof.
Claim 26
Dependent Claim
16 words
A process according to claIm 21, wherein R1 is H, -NHCH3, mono-lower-alkanoyl-amino, N-lower-alkyl-lower-alkanoyl-amino, di-lower-alkanoyl-amino or lower-alkanoyl-aminomethyl.
Claim 27
Dependent Claim
17 words
A process according to claim 21, wherein R1 is H, 13 CONHCH3 -N(CH3) COCH3, -CH2NHCOCH3 or -NHCOCH3.
Claim 28
Dependent Claim
10 words
A process according to claim 26, wherein X is ethylene.
References Cited (Backward Citations)
US3476802A
Cited
US3721701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |