US PATENT SUBCLASS 220 / 663
.~.~ Sight glass

Current as of: June, 1999
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220 /   HD   RECEPTACLES

660  DF  SIDEWALL STRUCTURE {7}
662  DF  .~ Transparent wall or portion {3}
663.~.~ Sight glass

DEFINITION

Classification: 220/663

Sight glass:

(under subclass 662) Receptacle wherein the transparent wall portion is in the form of a viewing port.

SEE OR SEARCH CLASS

73, Measuring and Testing,

426+, for a sight glass having measuring indicia.

116, Signals and Indicators,

276, for a sight glass in a fluid flow indicator.

215, Bottles and Jars, 365+, for a glass receptacle having a contents indicating wall portion.

222, Dispensing,

154+, for a dispensing container having transparent wall portions.

401, Coating Implements With Material Supply,

194, for an implement having a transparent portion through which the material supply can be viewed.