Patents Assigned to L. Giffard, S.A.
  • Breathing mask and its production process
    Patent number: 4723542
    Abstract: The mold has three layers of shrinkable material. The outside layer is provided with a plurality of recesses arranged as a fan. A granular filtering material is compressed in the recesses of layer closed by layer, during a later thermal operation, for example, a shaping of the mask.
    Type: Grant
    Filed: March 12, 1986
    Date of Patent: February 9, 1988
    Assignee: L. Giffard, S.A.
    Inventor: Louis Giffard