Patents by Inventor Martin Havránek

Martin Havránek 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).

  • Method of preparation of ethylene copolymers suitable for manufacturing films and pipes
    Patent number: 6569966
    Abstract: Method of preparation of ethylene copolymers suitable for manufacturing films or pipes so characterized that for the initiation of polymerization of ethylene and 1-alkene monomer a substantially innovated catalyst system containing silyl chromate compound is used. The catalyst system, containing a high yield structure A, is prepared by a sequential interaction of the following components: a) a silyl chromate compound completely freed from water and oxygen prior to its contact with the porous support, b) a support containing a suitable type and optimum concentration of hydroxyl groups, and c) an alkylating agent, being a combination of organometal compounds of aluminum (RO)AlR2 and magnesium (R1MgR2), the ratios between the components in the catalyst vary in the following ranges: content of silyl chromate on the support varies from 0.05 to 0.35% of the support weight, ratio between the total amount of organometals (ORG) to silyl chromate (expressed in terms of ORG/Cr) varies between 0.
    Type: Grant
    Filed: January 30, 2001
    Date of Patent: May 27, 2003
    Assignee: Polymer Institute Brno, Spol. S.R.O. & Chemopetrol, A.S.
    Inventors: Pavel {haeck over (S)}indelá{haeck over (r)}, Martin Havránek, Zdenek Salajka, Pavel Pe{haeck over (s)}ta, Kv{haeck over (e)}toslava {haeck over (S)}t{haeck over (e)}pánková, Ladislav Jansa