Patents by Inventor Christian Hassmann

Christian Hassmann 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).

  • Multi-ply filter medium
    Patent number: 9597621
    Abstract: The present invention relates to a filter composed of a multi-ply filter medium which (i) has at least one textile stiffening layer (layer 4), preferably a non-woven layer, of synthetic, polymer fibers, glass fibers or mixtures of the same, (ii) at least one filtration layer (layer 3), which is attached to at least one side of the non-woven stiffening fabric, the filtration layer being made up of glass fibers, (iii) at least one further filtration layer (layer 2), which is applied on the filtration layer according to ii), the further filtration layer being made up of glass fibers, and at least one textile cover layer (layer 1), which is applied on the filtration layer according to (iii), the cover layer being made up of synthetic polymer fibers.
    Type: Grant
    Filed: November 26, 2012
    Date of Patent: March 21, 2017
    Assignee: Johns Manville
    Inventors: Juergen Umminger, Christian Hassmann
  • Filter medium
    Patent number: 9028579
    Abstract: The present invention relates to a method for the manufacture of a multilayered filter medium whose air permeability is at least 500 l/m2sec and a multilayered filter medium obtainable by said method which, when charged with 5 mg/cm2 SAE-dust of the class “fine”, exhibits a pressure increase of no more than 100 Pa.
    Type: Grant
    Filed: May 15, 2013
    Date of Patent: May 12, 2015
    Assignee: Johns Manville
    Inventors: Christian Hassmann, Joerg Lehnert, Hans-Juergen Meitinger
  • FILTER MEDIUM
    Publication number: 20130305671
    Abstract: The present invention relates to a method for the manufacture of a multilayered filter medium whose air permeability is at least 500 l/m2sec and a multilayered filter medium obtainable by said method which, when charged with 5 mg/cm2 SAE-dust of the class “fine”, exhibits a pressure increase of no more than 100 Pa.
    Type: Application
    Filed: May 15, 2013
    Publication date: November 21, 2013
    Applicant: JOHNS MANVILLE
    Inventors: Christian Hassmann, Joerg Lehnert, Hans-Juergen Meitinger
  • Filter medium
    Patent number: 8147584
    Abstract: The present invention relates to a filter composed of a multi-ply filter medium, which comprises at least one non-woven stiffening layer, at least one filtration layer, at least one covering layer and where necessary at least one non-woven microfibre layer, the non-woven stiffening layer comprising fibers of synthetic polymers and the fibers being both partially oriented and oriented fibers.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: April 3, 2012
    Assignee: Johns Manville
    Inventors: Christian Hassmann, Hans-Jurgen Meitinger, Kurt Ploetz, Juergen Umminger, Michael Schoeps
  • FILTER MEDIUM
    Publication number: 20110253645
    Abstract: The present invention relates to a filter composed of a multi-ply filter medium, which comprises at least one non-woven stiffening layer, at least one filtration layer, at least one covering layer and where necessary at least one non-woven microfibre layer, the non-woven stiffening layer comprising fibres of synthetic polymers and the fibres being both partially oriented and oriented fibres.
    Type: Application
    Filed: June 28, 2011
    Publication date: October 20, 2011
    Inventors: Christian Hassmann, Hans-Jürgen Meitinger, Kurt Plotz, Jürgen Umminger, Michael Schops
  • Filter medium
    Patent number: 7993427
    Abstract: The present invention relates to a filter composed of a multi-ply filter medium, which comprises at least one non-woven stiffening layer, at least one filtration layer, at least one covering layer and where necessary at least one non-woven microfiber layer, the non-woven stiffening layer comprising fibers of synthetic polymers and the fibers being both partially oriented and oriented fibers.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: August 9, 2011
    Assignee: Johns Manville
    Inventors: Christian Hassmann, Hans-Jürgen Meitinger, Kurt Plötz, Jürgen Umminger, Michael Schöps
  • Filter medium
    Publication number: 20080302072
    Abstract: The present invention relates to a filter composed of a multi-ply filter medium, which comprises at least one non-woven stiffening layer, at least one filtration layer, at least one covering layer and where necessary at least one non-woven microfibre layer, the non-woven stiffening layer comprising fibres of synthetic polymers and the fibres being both partially oriented and oriented fibres.
    Type: Application
    Filed: May 23, 2008
    Publication date: December 11, 2008
    Inventors: Christian Hassmann, Hans-Jurgen Meitinger, Kurt Plotz, Jurgen Umminger, Michael Schops
  • Formwork for producing articles of concrete
    Patent number: 6450476
    Abstract: Formwork for producing articles of concrete is described, comprising a supporting means, a latticed sheet-like structure attached fast to the supporting means and a nonwoven fabric attached to the latticed sheet-like structure by means of a suitable adhesive.
    Type: Grant
    Filed: March 18, 1999
    Date of Patent: September 17, 2002
    Assignee: Johns Manville International, Inc.
    Inventors: Christian Hassmann, Andreas Schaab, Jürg Hausser
  • Textile sheet for use as a concrete mold liner
    Patent number: 5820775
    Abstract: The present invention relates to a concrete mold liner and to molds for concrete production which produce patterned or very smooth concrete surfaces.
    Type: Grant
    Filed: June 12, 1997
    Date of Patent: October 13, 1998
    Assignee: Hoechst Trevira GmbH & Co. KG
    Inventors: Stefanie Hiller, Christian Hassmann, Andreas Schaab