Patents by Inventor Juan Raul Quijada Abarca

Juan Raul Quijada Abarca 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).

  • Polypropylene composites with reinforcement based on eggshells: procedure to obtain the said composite, reinforcement based on eggshells, and procedure for obtaining it
    Patent number: 7459492
    Abstract: This invention reveals polypropylene composites to be used in the automotive, electronics, packaging and textile industries, which comprises a polypropylene homopolymer in a proportion ranging from 10 to 60% by weight, a natural reinforcement based on eggshells, and an antioxidant. This invention also reveals a natural reinforcement produced from eggshells obtained as an agroindustrial waste, the process to obtain said composite, and the process to obtain such reinforcement. By means of this invention, polypropylene composites using the natural reinforcement are obtained that have improved mechanical and thermal behavior when compared to polypropylene composites using traditional mineral reinforcements.
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: December 2, 2008
    Assignee: Universidad de Chile
    Inventors: José Luis Arias Bautista, Juan Raúl Quijada Abarca, Patricio Fernando Toro Estay, Pedram Mehrdad Yazdani
  • Process for preparing an ethylene polymerization catalyst and ethylene polymerization process
    Patent number: 6133188
    Abstract: A preparation process for a catalytic support, based on a special alumina modified with varying quantities of magnesium chloride is described, a higher rate of MgCl.sub.2 leading to a lesser quantity of heavy molecular chains in the final polymer. The support, prepared by milling the special alumina together with the MgCl.sub.2 previously treated with ethyl benzoate, is impregnated with TiCl.sub.4 in order to create the catalyst. The resulting catalysts show high activity, which enables the metallic residue and chloride eliminating stage to be avoided in the resin so created. Furthermore the types of molecular weight distribution and of mechanical properties are different for the polymers produced.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 17, 2000
    Assignees: Petroleo Brasileiro S.A. - Petrobras, Polialden Petroquimica S.A.
    Inventors: Juan Raul Quijada Abarca, Dellyo Ricardo dos Santos Alvares
  • Process for preparing an ethylene polymerization catalyst and ethylene polymerization process
    Patent number: 6018006
    Abstract: A preparation process for a catalytic support, based on a special alumina modified with varying quantities of magnesium chloride is described, a higher rate of MgCl.sub.2 leading to a lesser quantity of heavy molecular chains in the final polymer. The support, prepared by milling the special alumina together with the MgCl.sub.2 previously treated with ethyl benzoate, is impregnated with TiCl.sub.4 in order to create the catalyst. The resulting catalysts show high activity, which enables the metallic residue and chloride eliminating stage to be avoided in the resin so created. Furthermore the types of molecular weight distribution and of mechanical properties are different for the polymers produced.
    Type: Grant
    Filed: December 14, 1994
    Date of Patent: January 25, 2000
    Assignees: Petroleo Brasileiro S.A. - Petrobras, Polialden Petroquimica S.A.
    Inventors: Juan Raul Quijada Abarca, Dellyo Ricardo dos Santos Alvares