U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

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...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.

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Class 238 - Railways: surface track

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404 Subclasses


Subclasses list

Definition

This class includes patents relating to surface railway-tracks which in their make-up include road-bed structure, rail-supporting elements--such as stringers, ties, rail-chairs, and tie-plates--rails, rail-joints, rail-bonds, track and rail-joint fastenings, and electric insulation as applied to ties, rails, rail-joints, rail-bonds, and track-fastenings.

Lines with other classes and within this class

This class does not include patents for switches, rail-crossings, and frogs, which will be found in Class 246, Railway Switches and Signals.

Tracks for panel hangers and travelers are in Class 16, Miscellaneous Hardware, subclass 96.

 
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