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:
May. 26, 1992
Filed:
Sep. 06, 1991
Applicant:
Inventors:
Antonio Bonaldi, Chiuduno, IT;
Egidio Molinari, Longone del Segrino, IT;
Assignee:
Erregierre Industria Chimica S.p.A., San Paolo d'Argon, IT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07J / ;
U.S. Cl.
CPC ...
552553 ;
Abstract
A process for preparing 3-.alpha.-7-.beta.-dihydroxycholanic acid from a crude product containing up to 15% by weight of 3-.alpha.-7-.alpha.-dihydroxycholanic acid and up to 1% by weight of 3.alpha.-hydroxycholanic acid, by esterifying with methanol, crystallizing from a mixture of solvents consisting of methanol, an aromatic solvent and water and recrystallizing from a mixture of methanol, aromatic solvent and water.