Patents by Inventor Jean Lavina

Jean Lavina 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).

  • Alumina agglomerates and process for the preparation thereof
    Patent number: 6066308
    Abstract: Provided is a process for preparing alumina agglomerates which comprises:(i) treating agglomerates of active alumina with an aqueous medium comprising at least one acid making it possible to dissolve at least part of the alumina and at least one compound providing an anion capable of combining with aluminum ions in solution,(ii) subjecting the agglomerates to a hydrothermal treatment at a temperature in the range of from about 80.degree. C. to about 250.degree. C., and then(iii) thermally activating the agglomerates at a temperature in the range of about 500.degree. C. to about 1100.degree. C.The resulting alumina agglomerates possess exceptional mechanical strength, heat resistance and hydrothermal resistance and are useful as catalysts or catalyst supports.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: May 23, 2000
    Assignee: L'Institut Francais du Petrole
    Inventors: Thierry Dupin, Jean Lavina, Regis Poisson
  • Alumina agglomerates and process for the preparation thereof
    Patent number: 6056937
    Abstract: Provided is a process for preparing alumina agglomerates which comprises:(i) treating agglomerates of active alumina with an aqueous medium comprising at least one acid making it possible to dissolve at least part of the alumina and at least one compound providing an anion capable of combining with aluminum ions in solution,(ii) subjecting the agglomerates to a hydrothermal treatment at a temperature in the range of from about 80.degree. C. to about 250.degree. C., and then(iii) thermally activating the agglomerates at a temperature in the range of about 500.degree. C. to about 1100.degree. C.The resulting alumina agglomerates possess exceptional mechanical strength, heat resistance and hydrothermal resistance and are useful as catalysts or catalyst supports.
    Type: Grant
    Filed: June 28, 1993
    Date of Patent: May 2, 2000
    Assignee: L'Institut Francais du Petrole
    Inventors: Thierry Dupin, Jean Lavina, Regis Poisson
  • Process for the preparation of alumina agglomerates
    Patent number: 5244648
    Abstract: Provided is a process for preparing alumina agglomerates which comprises:(i) treating agglomerates of active alumina with an aqueous medium comprising at least one acid making it possible to dissolve at least part of the alumina and at least one compound providing an anion capable of combining with aluminum ions in solution,(ii) subjecting the agglomerates to a hydrothermal treatment at a temperature in the range of from about 80.degree. C. to about 250.degree. C., and then(iii) thermally activating the agglomerates at a temperature in the range of about 500.degree. C. to about 1100.degree. C.The resulting alumina agglomerates possess exceptional mechanical strength, heat resistance and hydrothermal resistance and are useful as catalysts or catalyst supports.
    Type: Grant
    Filed: April 2, 1992
    Date of Patent: September 14, 1993
    Assignee: Rhone-Poulenc Industries
    Inventors: Thierry Dupin, Jean Lavina, Regis Poisson