US4092479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Labeled 5,5-diphenylhydantoin derivatives for radioimmunoassay
Assignee: Baxter Healthcare Corp
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Filing: 1976-04-05
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Granted: 1978-05-30
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Expires: 1996-04-05
Abstract
Abstract Derivatives of 5,5-diphenylhydantoin having the following structural formula: ##STR1## where R is 2-acetyl, 3-propionyl, 4-butyryl or 5-valeryl and X is an unlabeled or radioiodinated amino radical; e.g., (tyrosine, histidine, tyrosinol, histamine). A preferred compound is radioiodinated 5,5-diphenyl-3-(5-valeryl-N-tyrosine) hydantoin. The iodine isotope may be iodine-125 or iodine-131.
Inventors
- 👤 George H. Parsons, Jr.
- 👤 Thomas Eller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:30
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54; C07D233/66; C07D233/72; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/94; G01N33/9473; Y; Y10; Y10S; Y10S436/00; Y10S436/804; Y10S436/815
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
2 words
Radioiodinated 5,5-diphenylhydantoin-3-(5-valeryl-N-tyrosine).
Claim 2
Dependent Claim
2 words
Radioiodinated 5,5-diphenylhydantoin-3-(5-valeryl-N-tyrosine).
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) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |