US4287362A
Expired / Lapsed
US
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2-Oxopropionaldehyde bis(thiosemicarbazone) derivatives
Assignee: Nihon Medi Physics Co Ltd
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Filing: 1980-01-18
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Granted: 1981-09-01
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Expires: 2000-01-18
Abstract
Abstract A radioactive diagnostic agent which comprises a protein and a radioactive metallic element combined with intervention of a bifunctional chelating agent of the formula: <IMAGE> wherein R1, R2, R3 and R4 are each a hydrogen atom or a C1-C3 alkyl group and is characteristic in having high stability even after administered into a human body.
Inventors
- 👤 Akira Yokoyama
- 👤 Yasushi Arano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:58
CPC Classifications
A; A61; A61K; A61K51/00; A61K51/02; A61K51/04; A61K51/08; A61K51/081; A61K51/088; A61K2123/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
33 words
A bifunctional chelating compound of the formula: ##STR4## wherein R 1 , R 2 , R 3 and R 4 are each a hydrogen atom or a C 1 -C 3 alkyl group.
Claim 2
Dependent Claim
33 words
A bifunctional chelating compound of the formula: ##STR4## wherein R 1 , R 2 , R 3 and R 4 are each a hydrogen atom or a C 1 -C 3 alkyl group.
Claim 3
Dependent Claim
27 words
The compound according to claim 1, wherein R 1 , R 2 and R 3 are each a hydrogen atom and R 4 is a methyl group.
Claim 4
Dependent Claim
27 words
The compound according to claim 1, wherein R 1 , R 2 and R 3 are each a hydrogen atom and R 4 is an ethyl group.
Claim 5
Dependent Claim
28 words
The compound according to claim 1, wherein R 1 and R 4 are each a methyl group and R 2 and R 3 are each a hydrogen atom.
References Cited (Backward Citations)
US3824276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |