| Class Number |
Class Name |
Patents |
| 73/1.01 |
Instrument proving or calibrating |
329 |
| 73/104 |
Surface and cutting edge testing |
365 |
| 73/11.01 |
Testing impact delivering device (e.g., a hammer) |
59 |
| 73/11.04 |
Testing of shock absorbing device (e.g., automobile shock absorber, gun recoil apparatus, etc.) |
79 |
| 73/112 |
Power plant or unit efficiency |
73 |
| 73/116 |
Motor and engine testing |
1,109 |
| 73/12.01 |
Testing by impact or shock |
179 |
| 73/121 |
Brake testing |
180 |
| 73/146 |
Tire, tread or roadway |
1,386 |
| 73/147 |
Wind tunnel: aerodynamic wing and propeller study |
300 |
| 73/148 |
Model basin and testing tank |
28 |
| 73/149 |
Volumetric content measuring |
343 |
| 73/150R |
Coating material: ink adhesive and/or plastic |
147 |
| 73/152.01 |
Borehole or drilling (e.g., drill loading factor, drilling rate, rate of fluid flow) |
129 |
| 73/156 |
Statistical record verifying |
6 |
| 73/157 |
Record strip sprocket hole testing |
8 |
| 73/158 |
Hoisting cable and rope |
32 |
| 73/159 |
Sheet, woven fabric or fiber |
542 |
| 73/161 |
Spring testing |
76 |
| 73/162 |
Toothed gear |
106 |
| 73/163 |
Coin |
41 |
| 73/164 |
Miner's lamp |
1 |
| 73/167 |
Ordnance and projectile |
223 |
| 73/168 |
Blower, pump, and hydraulic equipment |
411 |
| 73/169 |
Flour, dough, or bread |
29 |
| 73/170.01 |
Fluid flow direction (e.g., wind sock, weather vane, etc.) |
98 |
| 73/170.16 |
Meteorology |
142 |
| 73/170.29 |
Oceanology (e.g., oceans, rivers, or lakes) |
88 |
| 73/172 |
Orthopedic pressure distribution |
127 |
| 73/178R |
Navigation |
563 |
| 73/19.01 |
Gas content of a liquid or a solid |
169 |
| 73/23.2 |
Gas analysis |
936 |
| 73/290R |
Liquid level or depth gauge |
896 |
| 73/32R |
Specific gravity or density of liquid or solid |
200 |
| 73/35.01 |
Engine detonation (e.g., knock) |
64 |
| 73/35.14 |
Explosive |
46 |
| 73/36 |
Illuminating fluid |
27 |
| 73/37 |
With fluid pressure |
421 |
| 73/379.01 |
Muscular force (e.g., strength testing, exercising or training effort, etc.) |
175 |
| 73/382R |
Gravitational determination |
108 |
| 73/384 |
Barometer (e.g., altimeter) |
89 |
| 73/426 |
Measuring vessel |
80 |
| 73/430 |
Instrument mechanism dampening |
51 |
| 73/431 |
Instrument casing |
382 |
| 73/432.1 |
Miscellaneous |
176 |
| 73/488 |
Speed, velocity, or acceleration |
225 |
| 73/52 |
Testing sealed receptacle |
268 |
| 73/53.01 |
Liquid analysis or analysis of the suspension of solids in a liquid |
390 |
| 73/570 |
Vibration |
153 |
| 73/65.01 |
Center of gravity; turning moment; metacentric height |
58 |
| 73/66 |
Rotor unbalance |
85 |
| 73/7 |
By abrasion, milling, rubbing, or scuffing |
240 |
| 73/700 |
Fluid pressure gauge |
267 |
| 73/73 |
Moisture content or absorption characteristic of material |
569 |
| 73/760 |
Specimen stress or strain, or testing by stress or strain application |
398 |
| 73/78 |
Hardness |
109 |
| 73/86 |
Embrittlement or erosion |
210 |
| 73/861 |
Volume or rate of flow |
389 |
| 73/862 |
Dynamometers |
105 |
| 73/863 |
Sampler, sample handling, etc. |
286 |
| 73/865 |
Mass |
89 |
| 73/865.1 |
Human stress limit (e.g., decompression gauge for divers) |
62 |
| 73/865.2 |
Hydraulic altimeter |
20 |
| 73/865.3 |
Testing by imparting motion |
106 |
| 73/865.4 |
Analyzing bodily movement (e.g., skills or kinetics of handwriting) |
89 |
| 73/865.5 |
Particle size |
328 |
| 73/865.6 |
Simulated environment (e.g., test chambers) |
447 |
| 73/865.7 |
Touch or taste |
48 |
| 73/865.8 |
Inspecting |
712 |
| 73/865.9 |
Testing of apparatus |
659 |
| 73/866 |
Testing of material |
461 |
| 73/866.1 |
Instrument mechanism or transmission |
122 |
| 73/866.3 |
Display or display device details |
102 |
| 73/866.4 |
Specimen model or analog |
163 |
| 73/866.5 |
Probe or probe mounting |
863 |
| 73/87 |
Ductility or brittleness |
26 |
| 73/9 |
Frictional resistance, coefficient or characteristics |
309 |
| 73/900 |
Automatic gain control |
31 |
| 73/901 |
Digital readout |
14 |
| 73/DIG.1 |
Vibration |
155 |
| 73/DIG.10 |
Instrument mechanisms with acceleration compensation |
11 |
| 73/DIG.11 |
Photoelectric cell |
17 |
| 73/DIG.2 |
Magnetostrictive |
80 |
| 73/DIG.3 |
Hall effect |
55 |
| 73/DIG.4 |
Piezoelectric |
226 |
| 73/DIG.5 |
Liquid levels with magnetic transmission |
91 |
| 73/DIG.8 |
Fluid circuits |
9 |
| 73/DIG.9 |
Molten metal samplers |
80 |
