Patents by Inventor Poul Dahlberg Nielsen

Poul Dahlberg Nielsen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for the preparation of 5-carboxyphthalide
    Patent number: 6888009
    Abstract: 5-carboxyphthalide is obtained with very high purity and in high yields by a convenient process comprising reaction of terephthalic acid with paraformaldehyde HO(CH2)nH in oleum.
    Type: Grant
    Filed: May 6, 2002
    Date of Patent: May 3, 2005
    Assignee: H. Lundbeck A/S
    Inventors: Hans Petersen, Poul Dahlberg Nielsen
  • Method for the preparation of 5-carboxyphthalide
    Publication number: 20020165403
    Abstract: 5-carboxyphthalide is obtained with very high purity and in high yields by a convenient process comprising reaction of terephthalic acid 1
    Type: Application
    Filed: May 6, 2002
    Publication date: November 7, 2002
    Applicant: H. Lundbeck A/S
    Inventors: Hans Petersen, Poul Dahlberg Nielsen
  • Method for the preparation of 5-carboxyphthalide
    Patent number: 6403813
    Abstract: 5-carboxyphthalide is obtained with very high purity and in high yields by a convenient process comprising reaction of terephthalic acid with paraformaldehyde HO(CH2)nH in oleum.
    Type: Grant
    Filed: October 19, 2000
    Date of Patent: June 11, 2002
    Assignee: H. Lundbeck A/S
    Inventors: Hans Petersen, Poul Dahlberg Nielsen
  • Method for the preparation of 5-cyanophthalide
    Patent number: 6392060
    Abstract: A method for the preparation of 5-cyanophthalide in which 5-carboxyphthalide is converted to the corresponding amide of Formula (IV) in which R is hydrogen or C1-6 alkyl, which is then reacted with a dehydrating agent thereby obtaining 5-cyanophthalide. The conversion of 5-carboxyphthalide to the corresponding amide of Formula (IV) may be carried out via the corresponding C1-6 alkyl or phenyl ester or the acid chloride, which is converted to the amide of Formula (IV) by amidation with ammonia or a C1-6 alkylamine. By the process 5-cyanophthalide, an important intermediate used in the preparation of the antidepressant citalopram, is prepared in high yields by a convenient, cost effective procedure.
    Type: Grant
    Filed: June 22, 2001
    Date of Patent: May 21, 2002
    Assignee: H. Lundbeck A/S
    Inventors: Hans Petersen, Poul Dahlberg Nielsen
  • Method for the preparation of 5-cyanophthalide
    Publication number: 20020019546
    Abstract: A method for the preparation of 5-cyanophthalide in which 5-carboxyphthalide is converted to the corresponding amide of Formula (IV) 1
    Type: Application
    Filed: June 22, 2001
    Publication date: February 14, 2002
    Applicant: H. Lundbeck A/S
    Inventors: Hans Petersen, Poul Dahlberg Nielsen