Patents by Inventor Manfred Fedtke

Manfred Fedtke 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).

  • Initiators for cationic polymerization
    Patent number: 6162881
    Abstract: New initiators which are suitable for cationic polymerization have the following structure: ##STR1## such that following apply: R.sup.1 and R.sup.2 are alkyl or cycloalkyl or they, together with the S atom, form a heterocyclic ring,R.sup.3 is H or alkyl,R.sup.4, R.sup.5, R.sup.6, and R.sup.7 are H, alkyl, or alkoxy,X.sup.-- is a non-nucleophilic anion.Reaction resin mixtures with initiators of this type contain, in addition to a cationically polymerizable monomer and/or oligomer, 0.01 to 10% by mass of the initiator.
    Type: Grant
    Filed: June 26, 1998
    Date of Patent: December 19, 2000
    Assignee: Siemens Aktiegesellschaft
    Inventors: Lothar Schon, Wolfgang Rogler, Volker Muhrer, Manfred Fedtke, Andreas Palinsky
  • Reaction resin mixtures and use thereof
    Patent number: 6127092
    Abstract: Curable reaction resin mixtures which are suitable for stereolithography have the following composition:a cationically curable monomer and/or oligomer,an initiator with the following structure: ##STR1## where the following applies: R.sup.1 and R.sup.2 are alkyl or cycloalkyl, or together with the S atom they form a heterocyclic ring,R.sup.3 is H or alkyl,R.sup.4, R.sup.5, R.sup.6 and R.sup.7 are H, alkyl or alkoxy,X.sup.- is a non-nucleophilic anion,and optionally a filler, pigment and/or additive.
    Type: Grant
    Filed: June 26, 1998
    Date of Patent: October 3, 2000
    Assignee: Siemens AG
    Inventors: Lothar Schon, Wolfgang Rogler, Volker Muhrer, Manfred Fedtke, Andreas Palinsky
  • Polymerizable epoxide mixtures and process
    Patent number: 5525698
    Abstract: A polymerizable mixture comprising 100 parts by weight of at least one epoxy compound and 0.01 to 50 parts by weight of a metal complex compound of the formulaML.sub.x B.sub.y or M[SR].sub.x B.sub.z,wherein M is a metal ion of a metal of main groups II and III and sub-groups thereof of the Periodic Table, L is a chelate forming ligand selected from the group consisting of dioximes, .alpha.- and .beta.-hydroxycarbonyl compounds or enolizable 1,3-diketones, SR is an acid ion of an inorganic acid, B is a Lewis base, x is an integer from 1 to 8, y is an integer from 1 to 5 and z is an integer from 7 or 8 with the proviso that B is not a polyvalent phenolic compound and a process for the polymerization thereof.
    Type: Grant
    Filed: September 27, 1994
    Date of Patent: June 11, 1996
    Assignee: Rutgerswerke AG
    Inventors: Axel Bottcher, Egon Uhlig, Manfred Fedtke, Manfred Doring, Klaus Dathe, Bernd Nestler
  • Polymerizable epoxide mixtures and process using Lewis base complexes
    Patent number: 5395913
    Abstract: A polymerizable mixture comprising 100 parts by weight of at least one epoxy compound and 0.01 to 50 parts by weight of a metal complex compound of the formulaML.sub.x B.sub.y or M[SR].sub.x B.sub.z,wherein M is a metal ion of a metal of main groups II and III and sub-groups thereof of the Periodic Table, L is a chelate forming ligand selected from the group consisting of dioximes, .alpha.- and .beta.-hydroxycarbonyl compounds or enolizable 1,3-diketones, SR is an acid ion of an inorganic acid, B is a Lewis base, x is an integer from 1 to 8, y is an integer from 1 to 5 and z is an integer from 7 or 8 with the proviso that B is not a polyvalent phenolic compound and a process for the polymerization thereof.
    Type: Grant
    Filed: March 2, 1994
    Date of Patent: March 7, 1995
    Assignee: Rutgerswerke AG
    Inventors: Axel Bottcher, Egon Uhlig, Manfred Fedtke, Manfred Doring, Klaus Dathe, Bernd Nestler