Patents by Inventor Wolfgang Helbig

Wolfgang Helbig 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).

  • Microcontact printing of catalytic colloids
    Patent number: 6060121
    Abstract: A method of transferring a chemical activating agent from an applicator to a substrate surface involves providing an applicator having a raised application surface, applying a chemical activating agent to the application surface, contacting the substrate surface with the application surface, and removing the applicator. The chemical activating agent is transferred in a form in which it is capable of effecting a chemical reaction, such as catalysis, at the surface. Thus, following transfer of the chemical activating agent to the surface in a pattern, a metal can be plated at the substrate surface in the pattern. The applicator can be an elastomeric stamp having a raised portion defining a stamping surface.
    Type: Grant
    Filed: March 15, 1996
    Date of Patent: May 9, 2000
    Assignee: President and Fellows of Harvard College
    Inventors: Pirmin Hidber, Wolfgang Helbig, Enoch Kim, George M. Whitesides
  • Electrochemical reduction of metal salts as a method of preparing highly dispersed metal colloids and substrate fixed clusters by electrochemical reduction of metal salts
    Patent number: 5925463
    Abstract: The object of the invention is a method for the electrochemical preparation of metal colloids with particle sizes of less than 30 nm, characterized in that one or more metals of groups Ib, IIb, III, IV, V, VI, VIIb, VIII, lanthanoides, and/or actinoides of the periodic table are cathodically reduced in the presence of a stabilizer, optionally with a supporting electrolyte being added, in organic solvents or in solvent mixtures of organic solvents and/or water within a temperature range of between -78.degree. C. and +120.degree. C. to form metal colloidal solutions or redispersible metal colloid powders, optionally in the presence of inert substrates and/or soluble metal salts of the respective metals.The invention further relates to soluble or redispersible colloids as well as application on substrates and immobilization thereof, in particular for the preparation of catalysts.
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: July 20, 1999
    Assignee: Studiengesellschaft Kohle mbH
    Inventors: Manfred T. Reetz, Wolfgang Helbig, Stefan Andreas Quaiser
  • Electrochemical reduction of metal salts as a method of preparing highly dispersed metal colloids and substrate fixed metal clusters by electrochemical reduction of metal salts
    Patent number: 5620584
    Abstract: The object of the invention is a method for the electrochemical preparation of metal colloids with particle sizes of less than 30 nm, characterized in that one or more salts of one or more metals of groups Ib, IIb, III, IV, V, VI, VIIb, VIII, lanthanoides, and/or actinoides of the periodic table are cathodically reduced in the presence of a stabilizer, optionally with a supporting electrolyte being added, in organic solvents or in solvent mixtures of organic solvents and/or water within a temperature range of between -78.degree. C. and +120.degree. C. to form metal colloidal solutions or redispersible metal colloid powders, optionally in the presence of inert substrates and/or soluble metal salts of the respective metals. The invention further relates to soluble or redispersible colloids as well as application on substrates and immobilization thereof, in particular for the preparation of catalysts.
    Type: Grant
    Filed: March 9, 1995
    Date of Patent: April 15, 1997
    Assignee: Studiengesellschaft Kohle mbH
    Inventors: Manfred T. Reetz, Wolfgang Helbig, Stefan A. Quaiser