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![[Search a list of Patent Appplications for class 250]](../as.gif) Class 250 | RADIANT ENERGY |
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![[List of Patents for class 250 subclass 250]](../ps.gif) | 250 | RADIO AND MICROWAVE ABSORPTION WAVEMETERS |
| | 251 | ELECTRICALLY NEUTRAL MOLECULAR OR ATOMIC BEAM DEVICES AND METHODS |
| | 252.1 | CALIBRATION OR STANDARDIZATION METHODS |
| | 253 | GEOLOGICAL TESTING OR IRRADIATION |
| | 254 |  With drill or drilling |
| | 255 | With sampling |
| | 256 | Well testing apparatus and methods |
| | 257 |  With casing collar detection |
| | 258 | By interface of fluids |
| | 259 | With placement of tracer in or about well |
| | 261 | With detector or detector circuit control |
| | 262 | With particular detector signal circuit |
| | 267 | With radiation control to detector |
| | 268 | With well-engaging means |
| | 269.1 | With source and detector |
| | 269.2 |  With plural types of detectors |
| | 269.3 | Having gamma source and gamma detector |
| | 269.4 | Having neutron source and neutron detector |
| | 269.6 | Having neutron source and gamma detector |
| | 265 | Plural detectors |
| | 271 | CODED RECORD AND READERS; INVISIBLE RADIANT ENERGY TYPE |
| | 281 | IONIC SEPARATION OR ANALYSIS |
| | 282 | Methods |
| | 285 | With plural, simultaneous ion generators |
| | 286 | Ion beam pulsing means with detector synchronizing means |
| | 288 | With sample supply means |
| | 289 | With evacuation or sealing means |
| | 290 | Cyclically varying ion selecting field means |
| | 294 | Static field-type ion path-bending selecting means |
| | 301 | METHODS OF DETERMINING OIL PRESENCE, CONTAMINATION OR CONCENTRATION |
| | 302 | RADIATION TRACER METHODS |
| | 304 | METHODS INCLUDING SEPARATION OR NONRADIANT TREATMENT OF TEST MATERIALS |
| | 305 | ELECTRON ENERGY ANALYSIS |
| | 306 | INSPECTION OF SOLIDS OR LIQUIDS BY CHARGED PARTICLES |
| | 307 | Methods |
| | 308 | Including a radioactive source |
| | 309 | Positive ion probe or microscope type |
| | 310 | Electron probe type |
| | 311 | Electron microscope type |
| | 440.11 | Analyte supports |
| | 315.3 | SOURCE WITH CHARGED PLATE-TYPE DETECTOR |
| | 316.1 | WITH INFRARED OR THERMAL PATTERN RECORDING |
| | 324 | CORONA IRRADIATION |
| | 580 | SOURCE WITH RECORDING DETECTOR |
| | 581 | Using a stimulable phosphor |
| | 591 | Including a light beam read-out |
| | 328 | AUTOMATIC/SERIAL DETECTION OF SIMILAR SOURCES |
| | 329 | RECORD PROJECTORS |
| | 330 | INFRARED-TO-VISIBLE IMAGING |
| | 331 | Including liquid crystal detector |
| | 332 | Including detector array |
| | 333 | Including image tube-type detector |
| | 334 | Including means for scanning field of view |
| | 335 | CLOUD OR BUBBLE CHAMBERS |
| | 336.1 | INVISIBLE RADIANT ENERGY RESPONSIVE ELECTRIC SIGNALLING |
| | 336.2 | Superconducting type |
| | 337 | With heating of luminophors |
| | 338.1 | Infrared responsive |
| | 338.2 | Ferroelectric, ferromagnetic, photomagnetic types |
| | 338.3 | Pyroelectric type |
| | 338.4 | Semiconducting type |
| | 338.5 | With means to analyze uncontained fluent material |
| | 339.01 | With selection of plural discrete wavelengths or bands |
