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United States Patent Class 174 – Electricity: Conductors and Insulators

This is a selective list of subclasses in class 174.  This list comes from a December 1996 government document.

Subclass    Description
    1        MISCELLANEOUS
    2        LIGHTNING PROTECTION
    3        .Rods
    4 R    AIR TERMINALS
    4 C    .Coated and radioactive
    5 R    ELECTRIC SHOCK HAZARD PROTECTIVE DEVICES
    5 SB    .Shock protection, body insulation
    5 SG    .Shock protection, grounding devices
    6        EARTH GROUDS
    7        .Driving type
    8        WITH FLUIDS OR VACUUM
    9 R    .Current conductive fluid and/or vacuum
    9 F    ..Conductive fluid
    10        .With cable or conduit pre-installation devices
    11 R    .With fluid-condition responsive and/or indicating means
    11 BH    ..Bushings
    12 BH    ..Expansion bushings
    12 R    .With expansion and contraction means
    13        ..Built into conduit or cable
    14     R    .With fluid maintenance or conditioning means
    14 BH    ..Bushings
    15.1    .With cooling or fluid feeding, circulating or distributing
    15.2    ..By heat pipe
    15.3    ..for bushing or pothead
    15.4    ..Supercondictive type
    15.5    …For cable, conductor or joint
    15.6    ..For cable, conductor or joint
    15.7    ..For welding or furnace cable
    16.1    ..By ventilation or gas circulation
    16.2    …Of bus bars or bus ducts
    16.3    …With heat sink
    17 R    .Boxes and housings
    17.05    ..Hermetic sealed envelope type (e.g., with exhaust stem)
    17.06    …Liquid seal
    17.07    …Combined lead-in and exhaust tube
    17.08    …With electric connector
    17 LF    ..Liquid filled
    17 GF    ..Gas filled
    17 SF    ..Solid filled
    17 VA    ..Venting, absorption, expansion
    17 CT    ..Closures, terminals, gaskets
    18        ..With bushing, terminal or lead-in
    19        .Conduit or cable and structure
    20        ..With fluid stops
    21 JS    ..Joints: separable
    21 JR    ..Joints: rotatable
    21 JC    ..Joints: rotatable, coaxial
    21 C    ..Joints: coaxial angle expansion
    21 R    .Conduit or cable joints
    22 R    ..With fluid stops
    22 C    …Concentric
    23 R    .With fluid stops
    23 C.    ..Compositions
    137 R    INSULATORS
    137 A    .Coated
    137 B    .Compositions
    138 R    .Special application
    138 A    .Antennas
    138 C    ..Compositions
    138 H    ..Neon tube type
    138 J    ..Resistor or heater type
    139    .Combined
    140 R    ..With conductive arcing or stress distributing means
    140 C    …Coated
    140 H    …Hood type
    140 S    …Strain type
    140 CR    …Corona ring
    141 R    …Strings or stacks
    141 C    …Coated
    142    …Bushing type
    143    ….Condenser type
    144    …Arcing or grading devices
    145    ..With connector
    146    .Mid-line spacers
    147    ..Cross-over
    148    .Multiple insulator assemblies
    149 R    ..Multiple conductor
    149 B    …Bus bars
    150    ..Strings and stacks
    151    .Through wall or plate
    152 R    ..Bushing type
    152 A    …Antennas
    152 E    …Electric space discharge device
    152 S    …Spark plugs
    152 G    …Grommets or tubes
    152 GM    …Glass-to-metal seal
    153 R    …Opposed wall engaging means
    153 A    ….Antennas
    153 G    ….Grommets
    154    .Insulator and conductor embracing holder
    155    ..Divided insulator
    156    .Divided insulator
    157    ..Aligned through aperture
    158 R    .With insulator-supporting or attaching means
    158 F    ..Fence post insulators    
    159    ..Insulated nail or staple type
    160    ..Strand engaging suspension means
    161 R    ..Adjustably or movably mounted
    161 F    …Fence post insulators
    162    ..Double arm
    163 R    ..Support and/or insulator embracing or clamping
    163 F    …Fence post insulators
    164    ..Support penetrating
    165    …Penetrating element socketed in insulator
    166 R    …Through aperture, penetrating element clamped
    166 S    ….Stand-off insulators
    167    .With conductor receiving aperture or bushing type
    168    .With conductor holding means
    169    ..Fitting or terminal type
    170    …Hooks
    171    …Special conductor form
    172    ..Insulator embracing
    173    …Tie wires
    174    ..Insulator structure
    175    …Self-retaining
    176    .With terminal elements
    177    ..Plural
    178    …Multi-part, sectional or composite insulator
    179    ….Protected rod type
    180    ….Pin and opposed overlapping terminal
    181    …With insulated reinforcing or interlocking element
    182    …Cap and pin
    183    …Overlapping
    184    ….Interlinking
    185    ….Pin and opposed terminal
    186    …Caps
    187    ..Ventilating
    188    ..Cap type
    189    …Plastic material adhered
    190    …Divided cap
    191    …Clamps or clasps
    192    …Rings or wedges
    193    …Screw or bayonet
    194    ..Pin type
    195    …Multi-part insulators
    196    …Plastic material adhered
    197    …Clamps or clasps
    198    …Rings or wedges
    199    …Expanded
    200    …With thimble in socket
    201    …Through pin
    202    …Screw or bayonet type
    203    ….Strand thread
    204    ….Sheet material thread
    205    ….Soft yielding material pin
    206    ….Sockets
    207    ..Link or clevis
    208    .Link type
    209    .Sectional, multi-part, composite, or coated
    210    ..Pin socket type
    211    .With moisture or dirt removing or shedding
    212    .Surface configuration