Aggregate statistics from 44,592 USPTO patent filings across 113 technology classifications.
Updated August 19, 2026 · Citation guidelines
Source: Geyser Patent Attorney Directory · August 19, 2026
| # | Specialization | CPC | Practitioners | Patents | Allowance |
|---|---|---|---|---|---|
| 1 | Computing & Data Processing | G06 | 14,870 | 20,973 | 60.9% |
| 2 | Electric Communication Technology | H04 | 14,045 | 18,361 | 64.5% |
| 3 | Measuring & Testing | G01 | 6,564 | 998 | 63.5% |
| 4 | Climate Change Mitigation Technology | Y02 | 6,283 | 1,275 |
Computing & Data Processing has the most practitioners with 14,870 specialists.
Textiles & Paper (D10) leads with a 100% allowance rate.
Source: Geyser Patent Attorney Directory · August 19, 2026 · Citation guidelines
| 5 | Controlling & Regulating Systems | G05 | 5,783 | 1,011 | 62.4% |
| 6 | Bioinformatics & Health Informatics | G16 | 5,423 | 670 | 73.9% |
| 7 | Information Storage | G11 | 5,185 | 858 | 62.5% |
| 8 | Electronic Circuitry | H03 | 4,369 | 749 | 67.8% |
| 9 | Technical Subjects (Legacy USPC) | Y10 | 4,113 | 437 | 57.7% |
| 10 | Medical & Veterinary Science | A61 | 4,019 | 373 | 71.3% |
| 11 | Education & Display Devices | G09 | 3,849 | 401 | 61.3% |
| 12 | Checking & Counting Devices | G07 | 3,563 | 347 | 57.1% |
| 13 | Musical Instruments & Acoustics | G10 | 3,470 | 328 | 60.1% |
| 14 | Signalling & Display | G08 | 3,318 | 422 | 57.1% |
| 15 | Electric Power Generation & Distribution | H02 | 3,173 | 303 | 64% |
| 16 | Optics | G02 | 3,131 | 322 | 68.9% |
| 17 | Vehicles in General | B60 | 3,056 | 327 | 48% |
| 18 | Electric Elements & Components | H01 | 2,052 | 206 | 55.8% |
| 19 | Sports, Games & Amusements | A63 | 1,918 | 189 | 72% |
| 20 | Cross-Sectional Technology (Y04) | Y04 | 1,706 | 172 | 66.9% |
| 21 | Electric Techniques Not Covered Elsewhere | H05 | 1,694 | 145 | 62.8% |
| 22 | Aircraft & Aviation | B64 | 1,428 | 137 | 66.4% |
| 23 | Photography & Printing | G03 | 1,421 | 84 | 64.3% |
| 24 | Conveying & Packaging | B65 | 1,230 | 51 | 56.9% |
| 25 | Heating, Ranges & Ventilation | F24 | 1,169 | 129 | 74.4% |
| 26 | Plastics Working & Processing | B29 | 1,124 | 94 | 59.6% |
| 27 | Semiconductor Devices & Technology | H10 | 1,085 | 62 | 61.3% |
| 28 | Agriculture & Forestry | A01 | 893 | 75 | 70.7% |
| 29 | Hand Tools & Portable Power Tools | B25 | 860 | 61 | 62.3% |
| 30 | Biochemistry & Biotechnology | C12 | 729 | 26 | 69.2% |
| 31 | Additive Manufacturing | B33 | 728 | 99 | 60.6% |
| 32 | Engineering Elements & Fasteners | F16 | 715 | 30 | 66.7% |
| 33 | Machine Tools & Metal Working | B23 | 707 | 48 | 60.4% |
| 34 | Mechanical Engineering (F05) | F05 | 663 | 28 | 67.9% |
| 35 | Earth Drilling & Mining | E21 | 620 | 68 | 69.1% |
| 36 | Furniture & Domestic Articles | A47 | 619 | 44 | 59.1% |
| 37 | Physical & Chemical Processes | B01 | 534 | 15 | 53.3% |
| 38 | Casting & Powder Metallurgy | B22 | 522 | 39 | 46.2% |
| 39 | Machines for Liquids & Wind | F03 | 454 | 20 | 60% |
| 40 | Human Necessities (A24) | A24 | 396 | 6 | 33.3% |
| 41 | Land Vehicles & Cycles | B62 | 315 | 23 | 26.1% |
| 42 | Refrigeration & Cooling | F25 | 313 | 16 | 50% |
| 43 | Spraying & Atomizing | B05 | 284 | 11 | 54.5% |
| 44 | Hoisting & Lifting | B66 | 281 | 11 | 54.5% |
| 45 | Machines & Engines | F01 | 246 | 11 | 81.8% |
| 46 | Liquid Handling | B67 | 241 | 5 | 40% |
| 47 | Hydraulic Engineering & Foundations | E02 | 240 | 11 | 72.7% |
| 48 | Operations & Transport (B61) | B61 | 236 | 15 | 33.3% |
| 49 | Horology (Timekeeping) | G04 | 225 | 9 | 66.7% |
| 50 | Footwear | A43 | 225 | 33 | 87.9% |
| 51 | Combustion Engines | F02 | 221 | 11 | 90.9% |
| 52 | Locks, Keys & Closures | E05 | 217 | 20 | 35% |
| 53 | Hand Tools & Travel Articles | A45 | 201 | 11 | 63.6% |
| 54 | Nanotechnology | B82 | 183 | 14 | 28.6% |
| 55 | Heat Exchange | F28 | 168 | 4 | 25% |
| 56 | Building Construction | E04 | 162 | 9 | 55.6% |
| 57 | Pumps & Compressors | F04 | 162 | 13 | 53.8% |
| 58 | Life-Saving & Fire-Fighting | A62 | 153 | 5 | 40% |
| 59 | Food & Foodstuffs | A23 | 133 | 5 | 40% |
| 60 | Mechanical Metal-Working | B21 | 127 | 14 | 57.1% |
| 61 | Fluid-Pressure Actuators | F15 | 124 | 4 | 75% |
| 62 | Operations & Transport (B41) | B41 | 123 | 13 | 53.8% |
| 63 | Textiles & Paper (D10) | D10 | 123 | 3 | 100% |
| 64 | Operations & Transport (B08) | B08 | 122 | 6 | 33.3% |
| 65 | Fabric Treatment | D06 | 122 | 8 | 50% |
| 66 | Braiding & Lace-Making | D04 | 118 | 2 | 100% |
| 67 | Operations & Transport (B26) | B26 | 116 | 7 | 57.1% |
| 68 | Petroleum & Gas Industries | C10 | 109 | 1 | 100% |
| 69 | Weapons & Ammunition | F41 | 108 | 16 | 100% |
| 70 | Water Supply & Sewerage | E03 | 105 | 5 | 60% |
| 71 | Dyes, Paints & Adhesives | C09 | 103 | 5 | 80% |
| 72 | Ships & Marine Technology | B63 | 101 | 3 | 66.7% |
| 73 | Organic Chemistry | C07 | 94 | 6 | 50% |
| 74 | Human Necessities (A22) | A22 | 88 | 1 | 100% |
| 75 | Doors, Windows & Shutters | E06 | 87 | 8 | 87.5% |
| 76 | Roads, Railways & Bridges | E01 | 82 | 4 | 50% |
| 77 | Lighting | F21 | 73 | 7 | 57.1% |
| 78 | Organic Polymers & Compounds | C08 | 70 | 3 | 66.7% |
| 79 | Microstructural Technology (MEMS) | B81 | 65 | 2 | 50% |
| 80 | Cements & Ceramics | C04 | 61 | 4 | 100% |
| 81 | Operations & Transport (B31) | B31 | 60 | 2 | 100% |
| 82 | Nuclear Physics & Engineering | G21 | 58 | 7 | 85.7% |
| 83 | Coating Metallic Materials | C23 | 58 | 3 | 100% |
| 84 | Operations & Transport (B28) | B28 | 57 | 5 | 40% |
| 85 | Operations & Transport (B24) | B24 | 56 | 2 | 100% |
| 86 | Human Necessities (A42) | A42 | 45 | 3 | 66.7% |
| 87 | Operations & Transport (B43) | B43 | 42 | 1 | 0% |
| 88 | Combustion Apparatus | F23 | 42 | 5 | 80% |
| 89 | Operations & Transport (B07) | B07 | 39 | 2 | 0% |
| 90 | Layered Products & Composites | B32 | 37 | 4 | 75% |
| 91 | Human Necessities (A44) | A44 | 36 | 4 | 50% |
| 92 | Textiles & Paper (D05) | D05 | 34 | 2 | 100% |
| 93 | Oils, Fats & Detergents | C11 | 30 | 1 | 100% |
| 94 | Glass & Mineral Fibres | C03 | 27 | 2 | 50% |
| 95 | Paper Making | D21 | 26 | 4 | 75% |
| 96 | Human Necessities (A46) | A46 | 26 | 2 | 50% |
| 97 | Wearing Apparel | A41 | 21 | 3 | 33.3% |
| 98 | Gas & Liquid Storage | F17 | 21 | 6 | 33.3% |
| 99 | Operations & Transport (B44) | B44 | 19 | 1 | 100% |
| 100 | Operations & Transport (B30) | B30 | 18 | 2 | 100% |
| 101 | Operations & Transport (B42) | B42 | 15 | 3 | 33.3% |
| 102 | Mechanical Engineering (F27) | F27 | 14 | 2 | 100% |
| 103 | Natural & Artificial Threads | D01 | 14 | 1 | 100% |
| 104 | Inorganic Chemistry | C01 | 7 | 1 | 100% |
| 105 | Chemistry & Metallurgy (C40) | C40 | 5 | 1 | 100% |
| 106 | Water Treatment | C02 | 4 | 1 | 100% |
| 107 | Operations & Transport (B02) | B02 | 3 | 1 | 0% |