Patents Assigned to Degussa Novara Technology S.p.A.
  • Publication number: 20110095446
    Abstract: The present invention relates to a sol-gel process for the inexpensively and in large quantities agglomeration of silicon particles in a green body which is more suitable for industrial uses of silicon than the powder itself.
    Type: Application
    Filed: July 9, 2008
    Publication date: April 28, 2011
    Inventors: Daniele Fregonese, Andreas Rueckemann
  • Patent number: 7790232
    Abstract: Process for the preparation and the deposition of vitreous films on substrates comprising: the dissolution of one or more metal alkoxides in aprotic solvent, the hydrolysis of the resulting solution, the eventual removal of the formed alcohol, the deposition of the resulting sol on the substrate surface of interest and the final drying of the film.
    Type: Grant
    Filed: July 7, 2003
    Date of Patent: September 7, 2010
    Assignee: Degussa Novara Technology S.p.A.
    Inventors: Fulvio Costa, Lorenzo Costa
  • Publication number: 20080223078
    Abstract: Process for the production of monoliths of glass by means of the sol-gel process, comprising the following steps: a) dispersion in water of an oxide prepared by the pyrogenic route, b) hydrolysis of an alkoxide in aqueous solution to form a hydrolysate, c) mixing of the hydrolysate of the alkoxide with the oxide prepared by the pyrogenic route to form a colloidal sol, d) optional removal of coarse contents from the colloidal sol, e) gelling of the colloidal sol in a mould, f) replacement of the water contained in the resulting aerogel by an organic solvent, g) drying of the aerogel, h) heat treatment of the dried aerogel.
    Type: Application
    Filed: February 14, 2006
    Publication date: September 18, 2008
    Inventors: Giulio Boara, Fulvio Costa, Andreas Ruckemann
  • Publication number: 20070141359
    Abstract: The present invention relates to glassy inorganic films, characterized by a high chemical stability and a high adhesion, containing, among the others, titanium dioxide, employable to coat metal surfaces characterized by the presence of oxides, particularly stainless steel sheets. The coated structures obtained thereby, which are the second object of the present invention, are used to build many articles such as pipes, reactors, exchangers, containers, and so on. With reference to the peculiar case of stainless steel structures coated by the above film, these ones can be used in the food industry since that film coated article shows specific and very high photobactericide properties.
    Type: Application
    Filed: June 25, 2004
    Publication date: June 21, 2007
    Inventors: Fulvio Costa, Lucia Gini, Vincenzo Girardino, Lorenzo Costa
  • Patent number: 7216509
    Abstract: It is described a sol-gel process that allows to obtain dry gels, and possibly the corresponding dense glassy bodies, having higher dimensions compared to similar known processes.
    Type: Grant
    Filed: June 21, 2001
    Date of Patent: May 15, 2007
    Assignee: Degussa Novara Technology S.p.A.
    Inventors: Lorenzo Costa, Massimo Sparpaglione
  • Patent number: 7181862
    Abstract: Glassy articles are prepared by subjecting to hydrolysis and policondensation a solution or suspension of a suitable precursor, mainly comprising a silicon alkoxide, and by drying the obtained gel in a pressure chamber, the gel solvent having been substituted by a non-protic solvent, mainly acetone, under nitrogen flowing, at temperature and pressure conditions lower than the gel solvent critical values. The dried gel is then densified by a thermal treatment.
    Type: Grant
    Filed: December 23, 2003
    Date of Patent: February 27, 2007
    Assignee: Degussa Novara Technology, S.p.A.
    Inventors: Giulio Boara, Massimo Sparpaglione, Lorenzo Costa
  • Publication number: 20060218970
    Abstract: Particularly shaped articles constituted by silicon oxide, as such or with suitable additives, prepared by room temperature molding according to a process comprising: preparation of a sol starting from a silicon alcoxide, or from a silicon alcoxide and at least a precursor of at least one of the additional elements; hydrolysis of the sol obtained thereby; addition of colloidal silica; pouring the resulting mixture into the desired mould; sol gelling and fast removal of the solid product; gel drying; gel densification by means of a thermal treatment at temperature ranging from 900 ° C to 1500 ° C. The articles can be used as preforms for the optic fiber spinning.
    Type: Application
    Filed: March 12, 2004
    Publication date: October 5, 2006
    Applicant: Degussa Novara Technology S.p.A
    Inventors: Giulio Boara, Simone Pedretti, Andreas Rückemann, Massimo Sparpaglione
  • Patent number: 7060240
    Abstract: It is described a process based on sol-gel chemistry suitable to the production of nanocomposite materials being photoluminescent at ambient temperature, comprising silicon grains of dimension of nanometers embedded in a silica matrix.
    Type: Grant
    Filed: November 14, 2003
    Date of Patent: June 13, 2006
    Assignee: Degussa Novara Technology S.p.A.
    Inventors: Lorenzo Costa, Pier Paolo Costa, Fulvio Costa
  • Patent number: 7024890
    Abstract: Sol-gel process for the production of optical fiber preforms or overcladdings by preparing a sol, gelling the sol, drying the wet gel to a dry porous gel and densifying the dry gel to fully dense glass, wherein during the calcination treatment from 350° C. to 900° C. to remove organic impurities in the dry gel, it is carried out at least one reduced-pressure phase at a pressure comprised between about 0.01 and 0.5 bar.
    Type: Grant
    Filed: July 16, 2002
    Date of Patent: April 11, 2006
    Assignee: Degussa Novara Technology S.p.A.
    Inventors: Lorenzo Costa, Fulvio Costa, Matteo Crepaldi