US PATENT SUBCLASS 123 / 169 R
.~.~ Plugs

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

143 R  DF  IGNITERS {6}
146.5 R  DF  .~ Sparkers {11}
169 R.~.~ Plugs {15}
169 CL  DF  .~.~.~> Cleaners automatic {1}
169 CA  DF  .~.~.~> Compound insulation
169 CB  DF  .~.~.~> Core retaining
169 DW  DF  .~.~.~> Disk wrappings type
169 EL  DF  .~.~.~> Electrodes
169 EA  DF  .~.~.~> Adjustable gap
169 EB  DF  .~.~.~> Replaceable electrode
169 EC  DF  .~.~.~> Adjustable and replaceable
169 C  DF  .~.~.~> Cool
169 E  DF  .~.~.~> Insulated electrodes
169 G  DF  .~.~.~> Intensity in gap only
169 P  DF  .~.~.~> Insulating protecting {3}
169 MG  DF  .~.~.~> Multiple firing gap
169 TC  DF  .~.~.~> Transparent combustion chamber
169 V  DF  .~.~.~> Valved

Unofficial Alpha Subclasses: R CL CM CA CB DW EL EA EB EC E G P PA PB PH MG TC V

DEFINITION

Classification: 123/169

Combinations of a jump spark ignitor with internal combustion engine structure or an internal engine and spark plug accessory which is especially designed for use with an internal combustion engine.

(1) Note. This subclass relates, for example, to the combination of a spark plug and a cylinder head; the combination of a plug and cylinder space in which the interior of the skirt has a special claimed relationship to the cylinder volume; the combination of a spark plug with an adaptor of the screw coupling type (which, for example, permits a small plug to be inserted in a large hole or which acts to extend the shell skirt to provide a chamber for the spark), etc. Also included are accessories designed to fit onto the engine and also provided with means to hold the spark plug which are not of general utility.

SEE OR SEARCH CLASS

313, Electric Lamp and Discharge Devices, provides for the structure of spark plugs, per se. See especially

11.5, and 118+ and the subclasses mentioned in the Notes thereto for the subclasses to be searched for spark plugs. Note also the classes listed under "SEARCH CLASS" in Class 313, subclass 118 for other classes which provide for parts of spark plugs and accessories used with spark plugs.

315, Electric Lamp and Discharge Devices: Systems,

32, and indented subclasses, for electric space discharge devices of the spark plug type and other electric space discharge devices which have combined therewith an electric circuit element, such as a resistance inductance, or condenser, the discharge device and the circuit element being structurally united so as to form a unitary device.