Patents by Inventor Marie-Hélène Ritti

Marie-Hélène Ritti 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).

  • Process for producing a ceramic matrix composite part
    Patent number: 9302946
    Abstract: The invention relates to a process for producing a ceramic matrix composite (CMC) part by infiltration of a suspension (S) of a ceramic powder into a fibrous reinforcement (14). A suspension (S) of ceramic powder containing particles of chosen particle size, dispersed in at least one solvent, is prepared. The infiltration of the suspension is carried out in a single step in the fibrous reinforcement (14) positioned between a mold (12) and a permeable membrane (16), which makes it possible to apply a vacuum (V) and to subsequently remove the solvent from the suspension through the permeable membrane (16). The invention applies to the production of large-sized parts of complex shape, in particular in the field of aeronautics and aerospace engineering.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: April 5, 2016
    Assignee: OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AEROSPATIALES (ONERA)
    Inventors: Marie-Hélène Ritti, Bertrand Laine, Michel Parlier, Aurélie Julian-Jankowiak
  • PROCESS FOR PRODUCING A CERAMIC MATRIX COMPOSITE PART
    Publication number: 20130116109
    Abstract: The invention relates to a process for producing a ceramic matrix composite (CMC) part by infiltration of a suspension (S) of a ceramic powder into a fibrous reinforcement (14). A suspension (S) of ceramic powder containing particles of chosen particle size, dispersed in at least one solvent, is prepared. The infiltration of the suspension is carried out in a single step in the fibrous reinforcement (14) positioned between a mould (12) and a permeable membrane (16), which makes it possible to apply a vacuum (V) and to subsequently remove the solvent from the suspension through the permeable membrane (16). The invention applies to the production of large-sized parts of complex shape, in particular in the field of aeronautics and aerospace engineering.
    Type: Application
    Filed: April 18, 2011
    Publication date: May 9, 2013
    Inventors: Marie-Hélène Ritti, Bertrand Laine, Michel Parlier, Aurélie Julian-Jankowiak
  • Glass-ceramic Li-Al-Si-O composition and process for its production
    Patent number: 5232877
    Abstract: In the process according to the invention, a gel is prepared by hydrolysis and polycondensation of precursor compounds which comprise at least silicon alcoholate and aluminum alcoholate and inorganic compounds of lithium and/or magnesium, the solvent is removed, and the gel obtained is subjected to a heat treatment resulting in dehydration and oxidation, then to compacting and ceramisization.The composition obtained is substantially in the form of solid ceramic solutions, such as .beta.-spodumene, cordierite and mullite.
    Type: Grant
    Filed: March 30, 1992
    Date of Patent: August 3, 1993
    Assignee: Office National d'Etudes et de Recherches Aerospatiales
    Inventors: Guy Larnac, Jean Phalippou, Michel Parlier, Marie-Helene Ritti, Jean Jamet