US PATENT SUBCLASS 493 / 40
.~ Filter having indicator or inspection means

Current as of: June, 1999
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493 /   HD   MANUFACTURING CONTAINER OR TUBE FROM PAPER; OR OTHER MANUFACTURING FROM A SHEET OR WEB

39  DF  CIGARETTE FILTER MAKING {5}
40.~ Filter having indicator or inspection means

DEFINITION

Classification: 493/40

Filter having indicator or inspection means:

(under subclass 39) Method or apparatus wherein the filter formed is provided with means to show a condition of that filter, or of the gases or combustion products passing therethrough, or with means to allow the user to observe the interior of that filter.