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| Class Numbers & Titles | Class Numbers Only | USPC Index | International | HELP |
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| You are viewing a USPC Schedule. |
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| Class 375 | PULSE OR DIGITAL COMMUNICATIONS |
| Click here for a printable version of this file | |
![[List of Pre Grant Publications for class 375 subclass 130]](../as.gif) | ![[List of Patents for class 375 subclass 130]](../ps.gif) | 130 | SPREAD SPECTRUM |
| | 131 |  Hybrid form |
| | 132 | Frequency hopping |
| | 138 | Time hopping |
| | 139 | Chirp |
| | 140 | Direct sequence |
| | 211 | REPEATERS |
| | 216 | APPARATUS CONVERTIBLE TO ANALOG |
| | 218 | EARTH OR WATER MEDIUM |
| | 219 | TRANSCEIVERS |
| | 220 | Transmission interface between two stations or terminals |
| | 221 | Loopback mode |
| | 222 | Modems (data sets) |
| | 224 | TESTING |
| | 229 | EQUALIZERS |
| | 237 | PULSE NUMBER MODULATION |
| | 238 | PULSE WIDTH MODULATION |
| | 239 | PULSE POSITION, FREQUENCY, OR SPACING MODULATION |
| | 240 | BANDWIDTH REDUCTION OR EXPANSION |
| | 240.01 | Television or motion video signal |
| | 240.02 |  Adaptive |
| | 240.08 | Feature based |
| | 240.12 | Predictive |
| | 240.18 | Transform |
| | 240.21 | Subsampling |
| | 240.22 | Vector quantization |
| | 240.23 | Variable length coding |
| | 240.24 | Block coding |
| | 240.25 | Specific decompression process |
| | 240.26 | Associated signal processing |
| | 241 | Pulse code modulation |
| | 242 | PULSE CODE MODULATION |
| | 243 | Correcting or reducing quantizing errors |
| | 244 | Differential |
| | 253 | Length coding |
| | 254 | Noise or distortion reduction |
| | 256 | PULSE TRANSMISSION VIA RADIATED BASEBAND |
| | 257 | CABLE SYSTEMS AND COMPONENTS |
| | 259 | SYSTEMS USING ALTERNATING OR PULSATING CURRENT |
