| Class Number |
Class Name |
Patents |
| 73/1.01 |
Instrument proving or calibrating |
241 |
| 73/104 |
Surface and cutting edge testing |
337 |
| 73/11.01 |
Testing impact delivering device (e.g., a hammer) |
51 |
| 73/11.04 |
Testing of shock absorbing device (e.g., automobile shock absorber, gun recoil apparatus, etc.) |
70 |
| 73/112 |
Power plant or unit efficiency |
73 |
| 73/116 |
Motor and engine testing |
1,109 |
| 73/12.01 |
Testing by impact or shock |
146 |
| 73/121 |
Brake testing |
153 |
| 73/146 |
Tire, tread or roadway |
1,176 |
| 73/147 |
Wind tunnel: aerodynamic wing and propeller study |
261 |
| 73/148 |
Model basin and testing tank |
27 |
| 73/149 |
Volumetric content measuring |
300 |
| 73/150R |
Coating material: ink adhesive and/or plastic |
132 |
| 73/152.01 |
Borehole or drilling (e.g., drill loading factor, drilling rate, rate of fluid flow) |
106 |
| 73/156 |
Statistical record verifying |
6 |
| 73/157 |
Record strip sprocket hole testing |
8 |
| 73/158 |
Hoisting cable and rope |
29 |
| 73/159 |
Sheet, woven fabric or fiber |
506 |
| 73/161 |
Spring testing |
70 |
| 73/162 |
Toothed gear |
98 |
| 73/163 |
Coin |
40 |
| 73/164 |
Miner's lamp |
1 |
| 73/167 |
Ordnance and projectile |
197 |
| 73/168 |
Blower, pump, and hydraulic equipment |
380 |
| 73/169 |
Flour, dough, or bread |
28 |
| 73/170.01 |
Fluid flow direction (e.g., wind sock, weather vane, etc.) |
71 |
| 73/170.16 |
Meteorology |
115 |
| 73/170.29 |
Oceanology (e.g., oceans, rivers, or lakes) |
76 |
| 73/172 |
Orthopedic pressure distribution |
115 |
| 73/178R |
Navigation |
543 |
| 73/19.01 |
Gas content of a liquid or a solid |
152 |
| 73/23.2 |
Gas analysis |
795 |
| 73/290R |
Liquid level or depth gauge |
752 |
| 73/32R |
Specific gravity or density of liquid or solid |
177 |
| 73/35.01 |
Engine detonation (e.g., knock) |
50 |
| 73/35.14 |
Explosive |
38 |
| 73/36 |
Illuminating fluid |
24 |
| 73/37 |
With fluid pressure |
360 |
| 73/379.01 |
Muscular force (e.g., strength testing, exercising or training effort, etc.) |
150 |
| 73/382R |
Gravitational determination |
83 |
| 73/384 |
Barometer (e.g., altimeter) |
84 |
| 73/426 |
Measuring vessel |
64 |
| 73/430 |
Instrument mechanism dampening |
47 |
| 73/431 |
Instrument casing |
331 |
| 73/432.1 |
Miscellaneous |
161 |
| 73/488 |
Speed, velocity, or acceleration |
185 |
| 73/52 |
Testing sealed receptacle |
250 |
| 73/53.01 |
Liquid analysis or analysis of the suspension of solids in a liquid |
309 |
| 73/570 |
Vibration |
117 |
| 73/65.01 |
Center of gravity; turning moment; metacentric height |
45 |
| 73/66 |
Rotor unbalance |
66 |
| 73/7 |
By abrasion, milling, rubbing, or scuffing |
206 |
| 73/700 |
Fluid pressure gauge |
212 |
| 73/73 |
Moisture content or absorption characteristic of material |
511 |
| 73/760 |
Specimen stress or strain, or testing by stress or strain application |
204 |
| 73/78 |
Hardness |
98 |
| 73/86 |
Embrittlement or erosion |
194 |
| 73/861 |
Volume or rate of flow |
322 |
| 73/862 |
Dynamometers |
97 |
| 73/863 |
Sampler, sample handling, etc. |
194 |
| 73/865 |
Mass |
73 |
| 73/865.1 |
Human stress limit (e.g., decompression gauge for divers) |
60 |
| 73/865.2 |
Hydraulic altimeter |
20 |
| 73/865.3 |
Testing by imparting motion |
83 |
| 73/865.4 |
Analyzing bodily movement (e.g., skills or kinetics of handwriting) |
64 |
| 73/865.5 |
Particle size |
296 |
| 73/865.6 |
Simulated environment (e.g., test chambers) |
404 |
| 73/865.7 |
Touch or taste |
43 |
| 73/865.8 |
Inspecting |
540 |
| 73/865.9 |
Testing of apparatus |
553 |
| 73/866 |
Testing of material |
393 |
| 73/866.1 |
Instrument mechanism or transmission |
105 |
| 73/866.3 |
Display or display device details |
78 |
| 73/866.4 |
Specimen model or analog |
149 |
| 73/866.5 |
Probe or probe mounting |
723 |
| 73/87 |
Ductility or brittleness |
21 |
| 73/9 |
Frictional resistance, coefficient or characteristics |
277 |
| 73/900 |
Automatic gain control |
30 |
| 73/901 |
Digital readout |
13 |
| 73/DIG.1 |
Vibration |
155 |
| 73/DIG.10 |
Instrument mechanisms with acceleration compensation |
11 |
| 73/DIG.11 |
Photoelectric cell |
16 |
| 73/DIG.2 |
Magnetostrictive |
80 |
| 73/DIG.3 |
Hall effect |
55 |
| 73/DIG.4 |
Piezoelectric |
226 |
| 73/DIG.5 |
Liquid levels with magnetic transmission |
90 |
| 73/DIG.8 |
Fluid circuits |
9 |
| 73/DIG.9 |
Molten metal samplers |
80 |
