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Class Number Class Name Patents
420 Alloys or metallic compositions 21,081
119 Animal husbandry 22,168
134 Cleaning and liquid contact with solids 60,903
252 Compositions 88,287
501 Compositions: ceramic 39,469
106 Compositions: coating or plastic 82,128
34 Drying and gas or vapor contact with solids 27,507
349 Liquid crystal cells, elements and systems 73,544
184 Lubrication 7,617
72 Metal deforming 45,067
164 Metal founding 29,067
228 Metal fusion bonding 33,614
76 Metal tools and implements, making 3,100
148 Metal treatment 51,732
266 Metallurgical apparatus 14,049
208 Mineral oils: processes and products 44,187
299 Mining or in situ disintegration of hard material 7,010
977 Nanotechnology 20,128
264 Plastic and nonmetallic article shaping or treating: processes 182,083
425 Plastic article or earthenware shaping or treating: apparatus 87,503
419 Powder metallurgy processes 16,225
503 Record receiver having plural interactive leaves or a colorless color former, method of use, or developer therefor 8,858
117 Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor 25,800
508 Solid anti-friction devices, materials therefor, lubricant or separant compositions for moving solid surfaces, and miscellaneous mineral oil compositions 20,604
75 Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures 25,572
428 Stock material or miscellaneous articles 425,429
526 Synthetic resins or natural rubbers -- part of the class 520 series 102,932
527 Synthetic resins or natural rubbers -- part of the class 520 series 2,071
528 Synthetic resins or natural rubbers -- part of the class 520 series 142,143
525 Synthetic resins or natural rubbers -- part of the class 520 series 164,832
524 Synthetic resins or natural rubbers -- part of the class 520 series 176,251
523 Synthetic resins or natural rubbers -- part of the class 520 series 36,706
521 Synthetic resins or natural rubbers -- part of the class 520 series 42,987
520 Synthetic resins or natural rubbers -- part of the class 520 series 53
522 Synthetic resins or natural rubbers -- part of the class 520 series 37,041
245 Wire fabrics and structure 309
 
 
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