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:
Aug. 31, 1976
Filed:
Feb. 18, 1975
Applicant:
Inventors:
Giancarlo Sioli, Como, IT;
Luigi Giuffre, Milan, IT;
Franco Righi, Cesano Maderno, IT;
Giancarlo Matera, Milan, IT;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
260547 ;
Abstract
A method is disclosed for the preparation of alicyclic anhydrides, useful intermediates in the preparation of alicyclic ketenes which can be converted into lactams. The instant method comprises heat-treating an alicyclic acid in a metallic reactor, free of nickel, under subatmospheric pressure. A catalyst, such as an alkyl ester of selenphosphoric acid, has given good results.