Patents by Inventor Per O. Sundstrom

Per O. Sundstrom 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).

  • Patent number: 5158077
    Abstract: A filter container for direct or indirect connection to a protective mask comprises a cup-shaped casing having a bottom wall with an inhalation air intake formed therein, a cover closing the casing and having a top wall with an inhalation air outtake formed therein, a particle filter disposed within a bottom portion of the casing and secured around its circumference to an inner sidewall of the casing, and an absorption filter mounted between the particle filter and the cover within an upper portion of the casing. The bottom wall of the casing has a plurality of inwardly projecting, circumferentially spaced, radially directed stiffening ribs formed thereon, and the stiffening ribs have inwardly facing longitudinal edges lying substantially in a single plane. The particle filter has upper and lower folds, and engages at lower folds thereof the inwardly facing longitudinal edges of the stiffening ribs and engages at upper folds thereof a member supporting a bottom of the absorption filter.
    Type: Grant
    Filed: July 15, 1991
    Date of Patent: October 27, 1992
    Assignee: Sundstrom Safety AB
    Inventor: Per O. Sundstrom
  • Patent number: 5052385
    Abstract: The invention concerns a filter container for an absorption filter (8) and a particle filter (7), the container being adapted to be connected to a protective mask.
    Type: Grant
    Filed: October 27, 1987
    Date of Patent: October 1, 1991
    Assignee: Sundstrom Safety AB
    Inventor: Per O. Sundstrom
  • Patent number: D266196
    Type: Grant
    Filed: March 4, 1980
    Date of Patent: September 14, 1982
    Assignee: Sunstroms Respiratorer AB
    Inventor: Per O. Sundstrom