| Class Number |
Class Name |
Patents |
| 250/200 |
Photocells; circuits and apparatus |
125 |
| 250/250 |
Radio and microwave absorption wavemeters |
44 |
| 250/251 |
Electrically neutral molecular or atomic beam devices and methods |
582 |
| 250/252.1 |
Calibration or standardization methods |
1,141 |
| 250/253 |
Geological testing or irradiation |
282 |
| 250/271 |
Coded record and readers; invisible radiant energy type |
85 |
| 250/281 |
Ionic separation or analysis |
2,284 |
| 250/301 |
Methods of determining oil presence, contamination or concentration |
120 |
| 250/302 |
Radiation tracer methods |
212 |
| 250/304 |
Methods including separation or nonradiant treatment of test materials |
128 |
| 250/305 |
Electron energy analysis |
488 |
| 250/306 |
Inspection of solids or liquids by charged particles |
2,179 |
| 250/315.3 |
Source with charged plate-type detector |
35 |
| 250/316.1 |
With infrared or thermal pattern recording |
111 |
| 250/324 |
Corona irradiation |
332 |
| 250/328 |
Automatic/serial detection of similar sources |
173 |
| 250/329 |
Record projectors |
5 |
| 250/330 |
Infrared-to-visible imaging |
696 |
| 250/335 |
Cloud or bubble chambers |
7 |
| 250/336.1 |
Invisible radiant energy responsive electric signalling |
613 |
| 250/396R |
With charged particle beam deflection or focussing |
1,616 |
| 250/423R |
Ion generation |
1,317 |
| 250/428 |
Fluent material containment, support or transfer means |
133 |
| 250/453.11 |
Supported for nonsignalling objects of irradiation (e.g., with conveyor means) |
192 |
| 250/458.1 |
Luminophor irradiation |
1,573 |
| 250/472.1 |
Invisible radiation responsive nonelectric signalling |
148 |
| 250/489 |
Ion collectors |
29 |
| 250/491.1 |
Means to align or position an object relative to a source or detector |
871 |
| 250/492.1 |
Irradiation of objects or material |
1,962 |
| 250/493.1 |
Radiant energy generation and sources |
815 |
| 250/505.1 |
Radiation controlling means |
751 |
| 250/522.1 |
Source supports |
45 |
| 250/526 |
Miscellaneous |
51 |
| 250/580 |
Source with recording detector |
216 |
| 250/900 |
Optical liquid level sensors |
25 |
| 250/909 |
Methods and apparatus ancillary to stimulable phosphor systems |
33 |
| 250/910 |
Food sample analysis using invisible radiant energy source |
89 |
| 250/DIG.1 |
Passive intrusion detectors |
290 |
| 250/DIG.2 |
Radon detection |
117 |
