US4670545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chelating agents for technetium-99M
Assignee: University Patents Inc
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Filing: 1986-07-30
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Granted: 1987-06-02
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Expires: 2006-07-30
Abstract
Abstract The present invention relates to a novel family of Technetium chelating agents (ligands) based upon amide and mercaptide donor groups.
Inventors
- 👤 Alan R. Fritzberg
- 👤 Sudhakar Kasina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:57
CPC Classifications
C; C07; C07F; C07F13/00; C07F13/005; A; A61; A61K; A61K51/00; A61K51/02; A61K51/04; A61K51/0474; A61K51/0478; A61K2123/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
92 words
A compound according to the formula: ##STR8## wherein R 1 is selected from the group --H, --CH 2 CH 3 , and --COOH; and wherein R 2 is selected from the group consisting of --CH 2 CH 2 --, and --CH 2 --CHR'--CHR"--; wherein R' and R" are selected from the group --H, --COOH, and --OH with the proviso R' and R", are not concurrently --H, and R 1 is not --H when R 2 is from the group --CH 2 CH 2 -- and --CH 2 CH 2 CH 2 --.
Claim 2
Dependent Claim
92 words
A compound according to the formula: ##STR8## wherein R 1 is selected from the group --H, --CH 2 CH 3 , and --COOH; and wherein R 2 is selected from the group consisting of --CH 2 CH 2 --, and --CH 2 --CHR'--CHR"--; wherein R' and R" are selected from the group --H, --COOH, and --OH with the proviso R' and R", are not concurrently --H, and R 1 is not --H when R 2 is from the group --CH 2 CH 2 -- and --CH 2 CH 2 CH 2 --.
Claim 3
Dependent Claim
20 words
A compound according to claim 1 wherein R 1 is --COOH and R 2 is --CH 2 CH 2 --.
Claim 4
Dependent Claim
18 words
A compound according to claim 1 wherein R 1 is --COOH and R 2 is --CH 2 CHR'CHR".
References Cited (Backward Citations)
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US3873680A
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US3928552A
Cited
US4057615A
Cited
US4054645A
Cited
US4444690A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |