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US4255443A Expired / Lapsed US ⏱️ 0.0 years remaining

Homocysteine thiolactone perchlorate as a tumor promotor

Assignee: United States Department of Health and Human Services
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Filing: 1979-11-16
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Granted: 1981-03-10
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Expires: 1999-11-16
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Abstract

Abstract Homocysteine thiolactone perchlorate is prepared from the corresponding homocysteine thiolactone hydrochloride and optimally about two equivalents of perchloric acid as reactants. A preferred solvent utilized is chloroform-methanol (4:1) solution and a preferred temperature range is 0 DEG -85 DEG C. with the lower limit dependent upon the particular solvent and the upper limit of about 186 DEG C. dependent upon the melting point of the product crystals. The preferred perchloric acid reactant may be replaced with perchlorate salts such as AgClO4 or KClO4. The product perchlorate salt is soluble in organic solvents, whereas other known salts such as the hydrochloride are only water soluble. This property is thought to influence the growth effect of the perchlorate salt in animals, such as rabbits, and to influence the unique effect of the perchlorate salt on the growth of malignant tumors in animals, such as mice.

Inventors

  • 👤 Kilmer S. McCully

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 07:03
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/33; A61K31/38

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 32 words
A method of promoting the growth of malignant tumors in laboratory animals such as mice and rabbits which comprises utilizing intraperitoneally an effective amount of homocysteine thiolactone perchlorate in said laboratory animals.
Claim 2
Independent Claim 32 words
A method of promoting the growth of malignant tumors in laboratory animals such as mice and rabbits which comprises utilizing intraperitoneally an effective amount of homocysteine thiolactone perchlorate in said laboratory animals.

References Cited (Backward Citations)

US3068242A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-03-09 1984-09-08 1985-03-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-03-09 1988-09-08 1989-03-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-03-09 1992-09-08 1993-03-10 $7700.00 Window Closed / Lapsed

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