.~.~ Axial passage and/or through wall or plate {2}
31 S
.~.~.~ Spark plugs
Unofficial Alpha Subclasses: R S
DEFINITION
Classification: 174/31
(under subclass 30) Structures (1) having a passage arranged substantially axially thereof for receiving a conductor or other element to be insulated, and/or (2) for insulating a conductor or other object from a wall or plate through which the conductor or other object passes. Such devices are commonly known as bushings, terminals, and lead-ins.
(1) Note. The search should be continued in this class, subclass 18.
(2) Note. For similar devices not limited to use with fluids, see this class, subclasses 142, 143, 151, and indented subclasses, 154, 155, 156, 157, and 167. Merely claiming a fluid tight structure (such as having a fluid tight joint) will not cause classification in this subclass (31) where there is no other structure claimed which is
especially provided for use with a fluid. A structure which provides a chamber to contain a fluid will be classified in this subclass (31).
(3) Note. See conduit and cable end structures, this class, subclasses 19, 20 and 74 and indented subclasses, particularly subclass 75, for related structures where one end of the insulator structure engages the sheath or conduit (conductive or insulative) surrounding the conductors at or near the end thereof.
(4) Note. Search Class 313, Electric Lamp and Discharge Devices, subclass 120 for spark plugs having fluid feed or air vent means. This class (174) provides for spark plugs with such vents when the sparking electrodes are not claimed (i.e., when only the bushing and vent structure is claimed).
