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A
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HUMAN NECESSITIES
B
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PERFORMING OPERATIONSTRANSPORTING
C
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CHEMISTRYMETALLURGY
D
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TEXTILESPAPER
E
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FIXED CONSTRUCTIONS
F
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MECHANICAL ENGINEERINGLIGHTINGHEATINGWEAPONSBLASTING
F01
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ENGINES OR PUMPS
F01
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MACHINES OR ENGINES IN GENERALENGINE PLANTS IN GENERALSTEAM ENGINES
F02
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COMBUSTION ENGINESHOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
F03
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MACHINES OR ENGINES FOR LIQUIDSWIND, SPRING, OR WEIGHT MOTORSPRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
F04
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POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDSPUMPS FOR LIQUIDS OR ELASTIC FLUIDS
F15
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ENGINEERING IN GENERAL
F15
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FLUID-PRESSURE ACTUATORSHYDRAULICS OR PNEUMATICS IN GENERAL
F16
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ENGINEERING ELEMENTS OR UNITSGENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONSTHERMAL INSULATION IN GENERAL
F16B
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DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGESJOINTS OR JOINTING (couplings for transmitting rotation F16D)
F16C
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SHAFTSFLEXIBLE SHAFTSMECHANICAL MEANS FOR TRANSMITTING MOVEMENT IN A FLEXIBLE SHEATHINGELEMENTS OF CRANKSHAFT MECHANISMSPIVOTSPIVOTAL CONNECTIONSROTARY ENGINEERING ELEMENTS OTHER THAN GEARING, COUPLING, CLUTCH OR BRAKE ELEMENTSBEARINGS [5]
F16D
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COUPLINGS FOR TRANSMITTING ROTATION (gearing for conveying rotation F16H, e.g. fluid gearing F16H 39/00-F16H 47/00)CLUTCHES (dynamo-electric clutches H02K 49/00; clutches using electrostatic attraction H02N 13/00)BRAKES (electrodynamic brake systems for vehicles in general B60L 7/00; dynamo-electric brakes H02K 49/00) [2]
F16F
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SPRINGSSHOCK-ABSORBERSMEANS FOR DAMPING VIBRATION
F16G
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BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSESCHAINSFITTINGS PREDOMINANTLY USED THEREFOR
F16H
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GEARING
F16J
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PISTONSCYLINDERSPRESSURE VESSELS IN GENERALSEALINGS
F16K
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VALVESTAPSCOCKSACTUATING-FLOATSDEVICES FOR VENTING OR AERATING
F16L
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PIPESJOINTS OR FITTINGS FOR PIPESSUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBINGMEANS FOR THERMAL INSULATION IN GENERAL
F16L 1/00
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Laying or reclaiming pipesRepairing or joining pipes on or under water [1, 2, 5, 6, 2006.01]
F16L 1/024
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Laying or reclaiming pipes on land, e.g. above the ground (F16L 1/12 takes precedence) [5, 2006.01]
F16L 1/026
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. . in or on a frozen surface [6, 2006.01]
F16L 1/028
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. . in the ground (F16L 1/026 takes precedence) [5, 6, 2006.01]
F16L 1/032
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. . . the pipes being continuous (F16L 1/038 takes precedence) [5, 6, 2006.01]
F16L 1/036
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. . . the pipes being composed of sections of short length (F16L 1/038 takes precedence) [5, 6, 2006.01]
F16L 1/038
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. . . the pipes being made in situ [6, 2006.01]
F16L 1/06
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. . Accessories therefor, e.g. anchors [5, 2006.01]
F16L 1/09
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. . . for bringing two tubular members closer to each other [6, 2006.01]
F16L 1/10
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. . . for aligning [5, 2006.01]
F16L 1/11
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. . . for the detection or protection of pipes in the ground [6, 2006.01]
F16L 1/12
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Laying or reclaiming pipes on or under water [5, 2006.01]
F16L 1/14
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. . between the surface and the bottom [5, 2006.01]
F16L 1/15
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. . . vertically [6, 2006.01]
F16L 1/16
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. . on the bottom [5, 2006.01]
F16L 1/18
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. . . the pipes being S- or J-shaped and under tension during laying [5, 2006.01]
F16L 1/19
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. . . . the pipes being J-shaped [6, 2006.01]
F16L 1/20
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. . Accessories therefor, e.g. floats or weights [5, 2006.01]
F16L 1/225
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. . . Stingers [6, 2006.01]
F16L 1/23
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. . . Pipe tensioning apparatus [6, 2006.01]
F16L 1/235
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. . . Apparatus for controlling the pipe during laying [6, 2006.01]
F16L 1/24
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. . . FloatsWeights [5, 2006.01]
F16L 1/26
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Repairing or joining pipes on or under water [5, 2006.01]
F16L 3/00
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Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets (anchors for holding pipes on or under the ground F16L 1/06; noise absorbers in the form of specially adapted hangers or supports F16L 55/035; arrangements specially adapted for supporting insulated bodies F16L 59/12) [1, 5, 7, 2006.01]
F16L 5/00
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Devices for use where pipes, cables or protective tubing pass through walls or partitions (installations of electric cables or lines through walls, floors or ceilings H02G 3/22) [1, 2006.01]
F16L 7/00
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Supporting pipes or cables inside other pipes or sleeves, e.g. for enabling pipes or cables to be inserted or withdrawn from under roads or railways without interruption of traffic (sleeves for supporting pipes, cables or protective tubing, between relatively movable points F16L 3/01) [1, 5, 2006.01]
F16L 9/00
Pipes
F16L 9/00
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Rigid pipes [1, 2006.01]
F16L 11/00
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Hoses, i.e. flexible pipes [1, 5, 2006.01]
F16L 13/00
Pipe jointsHose nipples [2]
F16L 13/00
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Non-disconnectable pipe joints, e.g. soldered, adhesive, or caulked joints (joints for rigid pipes of plastics F16L 47/00) [1, 2006.01]
F16L 15/00
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Screw-threaded jointsForms of screw-threads for such joints [1, 2006.01]
F16L 17/00
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Joints with packing adapted to sealing by fluid pressure [1, 2006.01]
F16L 19/00
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Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts (F16L 17/00 takes precedence; if using bolts or equivalent connecting means F16L 23/00; connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics F16L 47/00) [1, 2006.01]
F16L 21/00
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Joints with sleeve or socket (F16L 13/00, F16L 17/00, F16L 19/00 take precedence; connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics F16L 47/00; specially adapted for pipes of brittle material F16L 49/00) [1, 2006.01]
F16L 23/00
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Flanged joints (F16L 13/00, F16L 17/00, F16L 19/00 take precedence; adjustable joints F16L 27/00; for hoses F16L 33/00; couplings of the quick-acting type F16L 37/00; for double-walled or multi-channel pipes, or pipe assemblies F16L 39/00; connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics F16L 47/00; specially adapted for pipes of brittle material F16L 49/00) [1, 2006.01]
F16L 25/00
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Construction or details of pipe joints not provided for in, or of interest apart from, groups F16L 13/00-F16L 23/00 (adjustable or allowing movement F16L 27/00; with fluid cut-off means F16L 29/00; quick-acting F16L 37/00; for double-walled or multi-channel pipes F16L 39/00; connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics F16L 47/00; specially adapted for pipes of brittle material F16L 49/00) [1, 2006.01]
F16L 27/00
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Adjustable jointsJoints allowing movement (of the quick-acting type F16L 37/50;  for double-walled or multi-channel pipes or pipe assemblies F16L 39/04) [1, 5, 2006.01]
F16L 29/00
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Joints with fluid cut-off means (quick-acting joints with cut-off means F16L 37/28) [1, 2006.01]
F16L 31/00
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Arrangements for connecting hoses to one another or to flexible sleeves (F16L 33/00 takes precedence) [1, 2006.01]
F16L 33/00
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Arrangements for connecting hoses to rigid membersRigid hose-connectors, i.e. single members engaging both hoses (connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics F16L 47/00) [1, 2006.01]
F16L 35/00
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Special arrangements used in connection with end fittings of hoses, e.g. safety or protecting devices [1, 2006.01]
F16L 37/00
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Couplings of the quick-acting type (radially-binding sleeves F16L 17/04, F16L 21/06;  connecting hoses to rigid members F16L 33/00) [1, 2006.01]
F16L 39/00
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Joints or fittings for double-walled or multi-channel pipes or pipe assemblies [1, 2006.01]
F16L 41/00
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Branching pipesJoining pipes to walls (F16L 39/00 takes precedence) [1, 2006.01]
F16L 43/00
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BendsSiphons (with cleaning apertures F16L 45/00) [1, 2006.01]
F16L 45/00
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Pipe units with cleaning aperture and closure therefor [1, 2006.01]
F16L 47/00
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Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics [1, 2006.01]
F16L 49/00
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Connecting arrangements, e.g. joints, specially adapted for pipes of brittle material, e.g. glass, earthenware [1, 2006.01]
F16L 51/00

F16L 51/00
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Expansion-compensation arrangements for pipe-lines (telescopic pipes F16L 27/12) [1, 2006.01]
F16L 53/00
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Heating of pipes or pipe systemsCooling of pipes or pipe systems [1, 2006.01, 2018.01]
F16L 55/00
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Devices or appurtenances for use in, or in connection with, pipes or pipe systems (F16L 1/00-F16L 53/00, F16L 57/00, F16L 59/00 take precedence;  repairing or joining pipes on or under water F16L 1/26;  cleaning of pipes B08B 9/02, e.g. removal of blockages B08B 9/027;  devices for preventing bursting of water pipes by freezing E03B 7/10) [1, 2006.01]
F16L 57/00
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Protection of pipes or objects of similar shape against external or internal damage or wear (supporting of pipes inside other pipes or sleeves F16L 7/00;  used in connection with end fittings of hoses F16L 35/00;  protection of pipes or pipe fittings against corrosion or incrustation F16L 58/00;  protection thereof during transport B65D 59/00) [1, 2006.01]
F16L 58/00
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Protection of pipes or pipe fittings against corrosion or incrustation (compound tubes F16L 9/14) [1, 2006.01]
F16L 59/00
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Thermal insulation in general [1, 2006.01]
F16L 101/00
Indexing scheme associated with groups F16L 55/26-F16L 55/48, relating to uses and applications of pigs or moles. [6]
F16L 101/00
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Uses or applications of pigs or moles [6, 2006.01]
F16M
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FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERESTANDSSUPPORTS
F16N
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LUBRICATING
F16P
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SAFETY DEVICES IN GENERAL
F16S
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CONSTRUCTIONAL ELEMENTS IN GENERALSTRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL
F16T
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STEAM TRAPS OR LIKE APPARATUS FOR DRAINING-OFF LIQUIDS FROM ENCLOSURES PREDOMINANTLY CONTAINING GASES OR VAPOURS
F17
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STORING OR DISTRIBUTING GASES OR LIQUIDS
F21
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LIGHTINGHEATING
F21
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LIGHTING
F22
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STEAM GENERATION
F23
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COMBUSTION APPARATUSCOMBUSTION PROCESSES
F24
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HEATINGRANGESVENTILATING
F25
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REFRIGERATION OR COOLINGCOMBINED HEATING AND REFRIGERATION SYSTEMSHEAT PUMP SYSTEMSMANUFACTURE OR STORAGE OF ICELIQUEFACTION OR SOLIDIFICATION OF GASES
F26
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DRYING
F27
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FURNACESKILNS, OVENS OR RETORTS [4]
F28
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HEAT EXCHANGE IN GENERAL
F41
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WEAPONSBLASTING
F41
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WEAPONS
F42
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AMMUNITIONBLASTING
F99
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SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION [2006.01]
G
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PHYSICS
H
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ELECTRICITY

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