US PATENT SUBCLASS 52 / 171.1
VIEWING PORT FOR SPECIFIC ENVIRONMENT

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

171.1VIEWING PORT FOR SPECIFIC ENVIRONMENT

DEFINITION

Classification: 52/171.1

VIEWING PORT FOR SPECIFIC ENVIRONMENT:

(under the class definition) Structure in which a transparent panel is installed in a wall, ceiling, or floor of, usually, a high temperature or pressure chamber for the purpose of watching an operation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

204.1+, for a window or door frame.

204.5+, for a window.

455+, for a door.

SEE OR SEARCH CLASS

126, Stoves and Furnaces,

200, for a heated stove door or window with a transparent panel.