Patents by Inventor Pierre Crooij

Pierre Crooij 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).

  • Intermediates for preparing .alpha.-carboxy-.alpha.-(3-thienyl)penicillin and cephalosporin derivatives
    Patent number: 4066664
    Abstract: A new process is disclosed for the preparation of alpha-carboxy-alpha-phenyl(or 3-thienyl)penicillin and cephalosporin derivatives.The process comprises reacting a 1.3-dioxane-4.6-dione derivative with the desired penicillanic or cephalosporanic acid derivative.
    Type: Grant
    Filed: September 27, 1976
    Date of Patent: January 3, 1978
    Assignee: Recherche et Industrie Therapeutiques
    Inventors: Pierre Crooij, Guy Simonet
  • 7-(3-Substituted ureido) cephalosporins
    Patent number: 3994886
    Abstract: Cephalosporin compounds with 3-substituted ureido or -thioureido group at position 7 and hydrogen or heterocyclicthiomethyl groups at position 3 are prepared. These compounds are antibacterial agents.
    Type: Grant
    Filed: June 3, 1975
    Date of Patent: November 30, 1976
    Assignee: Recherche et Industrie Therapeutiques (R.I.T.)
    Inventors: Pierre Crooij, Alain Colinet
  • 7-(3-Substituted ureido) cephalosporins
    Patent number: 3994887
    Abstract: Cephalosporin compounds with 3-substituted ureido or -thioureido group at position 7 and hydrogen or heterocyclicthiomethyl groups at position 3 are prepared. These compounds are antibacterial agents.
    Type: Grant
    Filed: June 4, 1975
    Date of Patent: November 30, 1976
    Assignee: Recherche et Industrie Therapeutiques (R.I.T.)
    Inventors: Pierre Crooij, Alain Colinet