The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 17, 1985
Filed:
Dec. 21, 1983
Applicant:
Inventor:
Yves Leroux, Paris, FR;
Assignee:
Minemet Rechreche, Trappes, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07F / ;
U.S. Cl.
CPC ...
2605 / ;
Abstract
A high efficiency process for producing hydroxy-diphosphonic acid derivatives of higher carboxylic acids comprising a first step of mixing a tri-valent phosphorous compound with the higher carboxylic acid in a molar ratio in the range of 13:12 to 18:12, and subsequently heating the reaction mixture to a temperature of 80.degree. to 110.degree. C. for about 3 to 20 hours. In one embodiment, a subsequent solvolysis step is employed wherein the product resulting from the heating step is heated with a solvent having a hydroxyl function.