Breathing mask and its production process

Details Breathing mask and its production process Breathing mask and its production process

1986-03-12

1988-02-09

Hafer, Robert A.

Surgery

Truss

Pad

A61F 556

Patent

active

047235420

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.

REFERENCES:
patent: 2120230 (1938-06-01), Cover
patent: 2798483 (1957-07-01), Kashima
patent: 3633575 (1972-01-01), Brumfield
patent: 4573464 (1986-03-01), Yo
patent: 4600002 (1986-07-01), Maryyanek et al.

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