Title:
PRODUCTION OF MASK AND MASK MATERIAL
Document Type and Number:
Japanese Patent JPS63240883
Kind Code:
A
Abstract:
The invention provides a filtration face mask which has an expanded filtration surface area and high filter efficiency. The mask includes at least two sidewall portions (13) generally extending away from the face of the wearer and away from an annular base (22). A frontal portion (14) bridges the sidewall portions (13) and at least two supporting arches structures (18) are disposed at the junction of the sidewall (16) and frontal portions (14).
Inventors:
DANIERU ARAN JIYAPANTEITSUKU
Application Number:
JP4852588A
Publication Date:
October 06, 1988
Filing Date:
March 01, 1988
Export Citation:
Assignee:
MINNESOTA MINING & MFG
International Classes:
A62B18/02; A41D13/11; A61F9/04; A62B23/02; A62B23/04; B01D39/14; B01D39/16; (IPC1-7): A61F9/04; A62B18/02; A62B23/04; B01D39/14; B01D39/16
Attorney, Agent or Firm:
Akira Asamura (3 outside)