Patents by Inventor Artur Toledo Martins De Oliveira

Artur Toledo Martins De Oliveira 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 the controlled production of polyethylene and its copolymers
    Patent number: 6723805
    Abstract: A process for producing high density polyethylene (HDPE) or linear low density polyethylene (LLDPE) in gas phase reactors, isolated or combined, using chromium or Ziegler-Natta catalysts, provided with on-line control of certain process variables as well as physical properties of the produced resin is described. Such process comprises the use of models for the inference of the physical properties and of the process variables that are not continuously measured as well as models which are relevant for the control of said properties and of the operating conditions of the process. The control of the process variables provides further the maximization of the production rate and of the catalyst productivity in the polymerization reaction.
    Type: Grant
    Filed: August 2, 2002
    Date of Patent: April 20, 2004
    Assignee: Braskem S.A.
    Inventors: Antonio Luiz Duarte Braganca, Esdras Piraguacy Demoro, Artur Toledo Martins De Oliveira
  • Process for the controlled production of polyethylene and its copolymers
    Publication number: 20030105247
    Abstract: A process for producing high density polyethylene (HDPE) or linear low density polyethylene (LLDPE) in gas phase reactors, isolated or combined, using chromium or Ziegler-Natta catalysts, provided with on-line control of certain process variables as well as physical properties of the produced resin is described. Such process comprises the use of models for the inference of the physical properties and of the process variables that are not continuously measured as well as models which are relevant for the control of said properties and of the operating conditions of the process. The control of the process variables provides further the maximization of the production rate and of the catalyst productivity in the polymerization reaction.
    Type: Application
    Filed: August 2, 2002
    Publication date: June 5, 2003
    Inventors: Antonio Luiz Duarte Braganca, Esdras Piraguacy Demoro, Artur Toledo Martins De Oliveira