FABRIC - Class 428
FACE BONDED - Classes 257, 438
FACER OR FACING (SEE MODULE) - Class 052
FAILURE - Classes 710, 712, 713
FAMOS - Class 438
FANNED LEADS - Class 257
FAR FIELD - Class 342
FASIC - Class 438
FAST (FISSION) REACTOR - Class 376
FAST NEUTRONS - Class 376
FASTENER - Class 403
FAT - Class 516
FAT and FATTY OIL - Class 106
FAT, FATTY OIL - Classes 106, 106, 106, 106, 106, 106, 106, 106, 106, 106, 106, 106, 106, 106, 204
FATS and FATTY OILS - Class 507
FATS, FATTY OILS - Class 507
FATTY ACID - Classes 514, 516, 520
FATTY ALCOHOL - Classes 507, 507
FATTY STILL RESIDUES - Classes 204, 507, 507
FAULT - Classes 710, 712, 713, 714
FCT - Class 438
FEC - Class 438
FED - Class 438
FEED - Classes 053, 208, 210, 226
FEED (of pattern, card, web, etc.) - Class 234
FEEDBACK - Class 388
FEEDER - Classes 226, 401, 460
FEEDING - Class 271
FEED-ROLL - Class 226
FEED-ROLLER - Class 400
FEMALE MOLD - Class 425
FERMENT - Class 426
FERMENTATE - Class 424
FERMENTATION - Class 435
FERMI-DIRAC STATISTICS - Class 977
FERRIMAGNETISM - Class 428
FERRITE SPINELS - Class 117
FERROMAGNETISM - Class 428
FERTILE MATERIAL - Class 376
FET - Classes 117, 257, 438
FIB - Class 438
FIBER - Classes 065, 112, 264, 428, 451, 501
FIBER (OPTICAL CABLE) - Class 725
FIDUCIAL - Class 356
FIELD EFFECT TRANSISTOR - Class 257
FIELD EFFECT TRANSISTOR (FET) - Class 438
FIELD OXIDE - Classes 257, 438
FIELD WINDING - Class 388
FILAMENT - Classes 065, 313, 330, 373, 428
FILE - Classes 707, 715
FILLER - Class 228
FILLING - Class 053
FILLING HEAD - Class 141
FILM STRIP - Classes 353, 355
FILTER - Classes 095, 096, 210, 330, 362
FILTER ELEMENT - Class 210
FILTER MEDIUM - Class 210
FILTRATE - Class 210
FILTRATION - Class 210
FINAL CONTROL DEVICE - Class 323
FINING - Class 065
FINISHING - Class 404
FIPOS - Class 438
FIRE TUBES - Class 122
FIRE-POLISHING - Class 065
FISSILE MATERIAL - Class 376
FISSION - Class 376
FISSIONABLE MATERIAL - Class 376
FLACCID - Class 403
FLACCID* - Class 024
FLAIL - Class 460
FLAKE - Class 428
FLAME HOLDER - Class 431
FLARE - Class 425
FLASH - Class 164
FLASH BACK - Class 431
FLASH DEVICE - Class 396
FLASH VAPORIZATION - Class 203
FLASHING - Classes 052, 065
FLASK - Class 164
FLAT PACK - Class 257
FLEXIBLE TRACK - Class 305
FLINT - Class 431
FLIP-CHIP - Classes 257, 438
FLOATERS - Class 065
FLOATING DIFFUSION - Classes 257, 438
FLOATING GATE - Classes 257, 438
FLOC - Class 210
FLOCCULATE; FLOCCULATING AGENT*’ FLOCCULANT - Class 516
FLOCCULATION - Class 210
FLOTATION - Class 423
FLOTOX - Class 438
FLOW LINE: - Class 166
FLOW REGULATOR - Class 239
FLOW-REGULATOR - Class 401
FLUENT MATERIAL - Classes 249, 250, 425
FLUID - Classes 166, 210, 239, 347
FLUID CONVEYOR INLET - Class 406
FLUID CONVEYOR OUTLET - Class 406
FLUID CURRENT CONVEYOR - Class 406
FLUID MIXTURE - Classes 095, 096
FLUID(S) - Class 277
FLUIDIZED BED - Classes 075, 423
FLUIDIZED BED (FISSION) REACTOR - Class 376
FLUORESCENT OR PHOSPHORESCENT MATERIAL - Class 313
FLUOROUS SYNTHESIS - Class 506
FLUX - Classes 164, 228
FLYING - Class 083
FLYING TOOL - Class 072
FOAM - Class 516
FOCUSING - Class 396
FOG - Class 516
FOLLOWER - Class 401
FONT - Class 400
FOOD - Class 099
FOOTPRINT - Class 257
FORBIDDEN ENERGY BAND - Class 438
FORBIDDEN ENERGY BAND/REGION/GAP - Class 257
FORCE: - Classes 073, 073
FORMAT - Class 348
FORWARD BIAS - Class 257
FORWARD BREAKOVER POTENTIAL - Class 257
FORWARD CURRENT - Class 257
FOULING - Class 210
FOUR-LAYER DIODE - Class 257
FOUR-PHASE CCD - Class 257
FOUR-SIDE LEAD LAYOUT - Class 257
FOX - Class 438
FPD - Class 438
FPGA - Class 438
FRACTIONAL DISTILLATION - Classes 202, 203
FRACTIONATION - Class 208
FRAME - Classes 351, 352, 396
FRAME TRANSFER CCD - Classes 257, 438
FREE ELECTRON - Class 257
FREE EDGE(*) - Class 412
FREE RUNNING OSCILLATOR - Class 331
FREE SPACE - Classes 342, 343
FREQUENCY - Class 334
FREQUENCY ADJUSTING MEANS - Class 331
FREQUENCY BAND - Class 334
FREQUENCY CONVERSION - Class 363
FREQUENCY DETERMINING ELEMENT - Class 331
FREQUENCY DOMAIN - Class 348
FREQUENCY RESPONSIVE MEANS - Class 330
FREQUENCY RESPONSIVE NETWORK - Class 333
FREQUENCY SELECTIVE MEANS - Class 330
FREQUENCY STABILIZATION - Class 331
FRIT - Class 501
FRONT(*) - Class 412
FTIR - Class 438
FUEL - Classes 060, 110
FUEL CELL - Classes 320, 429
FUEL COMPONENT: - Class 149
FUEL, FUEL ELEMENT, or FUEL COMPONENT - Class 376
FUGITIVE MATERIAL - Class 419
FUGITIVE TINTING - Class 008
FULL-BANK - Class 234
FULLERENE - Class 977
FULLERIDE - Class 977
FULLY IONIZED - Class 376
FUME - Class 516
FUMED SILICA - Class 516
FUNCTION - Class 400
FUNNEL - Class 141
FURNACE - Class 373
FUROX - Class 438
FUSED OR BRIDGED RING SYSTEM - Classes 514, 520
FUSION - Class 376
FUSION BONDING - Class 065
FUZZY LOGIC - Class 701