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:
Jan. 18, 1977
Filed:
Dec. 10, 1975
Applicant:
Inventors:
Pierpaolo Garibaldi, San Donato Milanese, IT;
Fausto Calderazzo, Ghezzano, IT;
Assignee:
Snam Progretti S.p.A., San Donato Milanese, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07F / ;
U.S. Cl.
CPC ...
2604292 ; 2604 / ;
Abstract
A method is disclosed for the preparation of ytterbium(III) beta-diketonates, the improvement consisting in that the reaction between an ytterbium(III) halide and a chelating agent (such as acetylacetone, dibenzoylmethane and dipivaloylmethane for example) is caused to take place in an anhydrous medium and in the presence of gaseous ammonia, the ytterbium(III) halide being also anhydrous.