Patents by Inventor Anna-Maria Weiss

Anna-Maria Weiss 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).

  • Protective breathing mask
    Patent number: 4883052
    Abstract: A multi-layer protective breathing mask adapted to cover the mouth and the nose of a wearer thereof comprises an outer layer, an inner layer and, between the outer and inner layers, a filter element comprising a particle filter and an adsorber filter. The adsorber filter may comprise one or more layers of foam material and the layers of foam material may be of different porosities. The at least one layer of foam material adsorber particles which may preferably be of a plurality of particle sizes.
    Type: Grant
    Filed: September 11, 1987
    Date of Patent: November 28, 1989
    Assignee: Helsa-Werke Helmut Sandler GmbH & Co. KG
    Inventors: Anna-Maria Weiss, Klaus Smolik