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:
Apr. 21, 2026
Filed:
Apr. 08, 2022
Applicant:
Industriale Chimica S.r.l., Milan, IT;
Inventors:
Roberto Lenna, S. Giorgio su Legnano, IT;
Michele Baldrighi, Milan, IT;
Assignee:
INDUSTRIALE CHIMICA S.R.L., Milan, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07J 53/00 (2006.01);
U.S. Cl.
CPC ...
C07J 53/008 (2013.01);
Abstract
The present invention refers to a process for the industrial-scale preparation of 17β-hydroxy-6β,7β; 15β,16β-dimethylene-3-oxo-17α-pregn-4-ene-21-carboxylic acid γ-lactone, known by the common name of Drospirenone, in the form of a fine powder without the use of mechanical grinding or micronization techniques, but rather exploiting a double change of crystalline form, from Crystalline Form I to Crystalline Form II and from Crystalline Form II to Crystalline Form I. The invention also refers to the new Crystalline Form II of Drospirenone obtained in the process.