Respiratory method or device > Means for removing substance from respiratory gas > Particulate filtering > Face mask covering a breathing passage > With separate filter encircling element, or housing, securing filter on mask > Patents

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Class Information
Number: 128/206.17
Name: Surgery > Respiratory method or device > Means for removing substance from respiratory gas > Particulate filtering > Face mask covering a breathing passage > With separate filter encircling element, or housing, securing filter on mask
Description: Subject matter including a separate filter encircling element, or housing, securing the filter on the mask.

Patents under this class:

1 2 3 4

Patent Number	Title Of Patent	Date Issued
4294599	Aerosol filter cartridge	Oct. 13, 1981
4179274	Respirator filter and method of making the same	Dec. 18, 1979
4154586	Respirator cartridge end-of-service lift indicator system and method of making	May. 15, 1979
4088461	Combination of a supplementary filter and respirator filter	May. 9, 1978
3944803	Lantern safety device	Mar. 16, 1976
3944403	Adsorptive devices	Mar. 16, 1976
3943403	Electrodeless light source utilizing a lamp termination fixture having parallel capacitive impedance matching capability	Mar. 9, 1976