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2 077 900

(13)

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(51)

IPC

(21) (22)

Application

95100659/12, 1995-01-11

(22)

Actual filing date

1995-01-11

(45)

Published

1997-04-27

(72)

Inventor

Khabarova Nadezhda Protoleonovna

(73)

Holder

Khabarova Nadezhda Protoleonovna

METHOD FOR MANUFACTURING RESPIRATION HALF-MASK Russian patent published in 1997 - IPC

Abstract RU 2077900 C1

FIELD: individual means for protecting human respiratory system from dust. SUBSTANCE: first workpiece is cut out in the form of figure outlined essentially by one principal and two additional circumferences. Next, to form half-mask volume, principal circumference is supplemented in nasal region with another figure formed by sector 98-102 deg and, in chin region, with third figure formed by sector 72-75 deg. Additional figures-sectors are fixed in place in the form of internal folds having inwardly turned strip of filtering material. EFFECT: invention is useful for making half-masks for light-weight respirators. 8 dwg

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RU 2 077 900 C1

Authors

Khabarova Nadezhda Protoleonovna

Dates

1997-04-27—Published

1995-01-11—Filed

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