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. 03, 2005
Filed:
May. 06, 2002
Applicants:
Hans Petersen, Vanløse, DK;
Poul Dahlberg Nielsen, Vig, DK;
Inventors:
Hans Petersen, Vanløse, DK;
Poul Dahlberg Nielsen, Vig, DK;
Assignee:
H. Lundbeck A/S, Valby-Copenhagen, DK;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D307/77 ;
U.S. Cl.
CPC ...
Abstract
5-carboxyphthalide is obtained with very high purity and in high yields by a convenient process comprising reaction of terephthalic acidwith paraformaldehyde HO(CH)H in oleum.