Patents by Inventor Bertram R. Bohringer

Bertram R. Bohringer 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).

  • Non-porous, breathable membrane containing polyamide-4,6
    Patent number: 6706413
    Abstract: The present invention is a non-porous, breathable membrane of at least polyamide-4,6, with an elongation at rupture of about 250 to about 500% in the longitudinal direction and about 200 to about 500% in the transverse direction. The membrane has a higher heat resistance than a non-porous, breathable membrane made from polyether ester and, if it also contains an antioxidant, passes the oven/watertightness test. If the membrane is produced from a mixture of polyamide-4,6 and about 10 to about 30% by weight polyether amide, the membrane exhibits a surprisingly increased water-vapor permeability. The membrane is usable in the manufacture of thermally protective clothing.
    Type: Grant
    Filed: April 3, 2002
    Date of Patent: March 16, 2004
    Assignee: Sympatex Technologies GmbH
    Inventors: Bertram R. Böhringer, Henricus Joannes Maria Van De Ven, Jozef Christiaan Wilhelmus Spijkers
  • Non-porous, breathable membrane containing polyamide-4,6
    Publication number: 20020155307
    Abstract: The present invention is a non-porous, breathable membrane of at least polyamide-4,6, with an elongation at rupture of about 250 to about 500% in the longitudinal direction and about 200 to about 500% in the transverse direction. The membrane has a higher heat resistance than a non-porous, breathable membrane made from polyether ester and, if it also contains an antioxidant, passes the oven/watertightness test. If the membrane is produced from a mixture of polyamide-4,6 and about 10 to about 30% by weight polyether amide, the membrane exhibits a surprisingly increased water-vapor permeability. The membrane is usable in the manufacture of thermally protective clothing.
    Type: Application
    Filed: April 3, 2002
    Publication date: October 24, 2002
    Applicant: SYMPATEX TECHNOLOGIES GMBH
    Inventors: Bertram R. Bohringer, Henricus Joannes Maria Van De Ven, Jozef Christiaan Wilhelmus Spijkers