Patents by Inventor Joaquin Barrera Calderon

Joaquin Barrera Calderon 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).

  • Imaging and erasing of a printing form made of polymer material containing imide groups
    Patent number: 6919165
    Abstract: A method for producing a pattern of hydrophilic (34) and hydrophobic (32) regions on a printing form (30) is presented which, in a first, essentially unpatterned state, features a polymer material containing imide groups, for example, polybenzene diimide or polyamide imide. The method includes a chemical treatment of the surface with an oxidizing agent subsequent in time to a locally selective exposure with UV light. Optionally, the locally selective exposure can be preceded by a large-area chemical treatment of the surface with a strong base. The printing form (30) can be restored to the first state by a large-area chemical treatment of the surface with a strong acid. The patterned printing form (30) is suitable for use in offset printing.
    Type: Grant
    Filed: April 15, 2002
    Date of Patent: July 19, 2005
    Assignee: Heidelberger Druckmaschinen AG
    Inventor: Joaquin Barrera Calderon
  • Imaging and erasing of a printing form made of polymer material containing imide groups
    Publication number: 20020177053
    Abstract: A method for producing a pattern of hydrophilic (34) and hydrophobic (32) regions on a printing form (30) is presented which, in a first, essentially unpatterned state, features a polymer material containing imide groups, for example, polybenzene diimide or polyamide imide. The method includes a chemical treatment of the surface with an oxidizing agent subsequent in time to a locally selective exposure with UV light. Optionally, the locally selective exposure can be preceded by a large-area chemical treatment of the surface with a strong base. The printing form (30) can be restored to the first state by a large-area chemical treatment of the surface with a strong acid. The patterned printing form (30) is suitable for use in offset printing.
    Type: Application
    Filed: April 15, 2002
    Publication date: November 28, 2002
    Applicant: Heidelberger Druckmaschinen AG
    Inventor: Joaquin Barrera Calderon