US Patent Class 375
PULSE OR DIGITAL COMMUNICATIONS-- Main Headings
 Electronic File Wrappers |  Electronic Patent Documents |  Paper Patent Documents | Current as of: June, 1999
|  and Services |
| Electronic File Wrappers | Electronic Patent Documents | Paper Patent Documents | Current as of: June, 1999
| and Services |
| CLASS NOTES | ||
| 200 | DF | SPREAD SPECTRUM {7} |
| 211 | DF | REPEATERS {3} |
| 216 | DF | APPARATUS CONVERTIBLE TO ANALOG {1} |
| 218 | DF | EARTH OR WATER MEDIUM |
| 219 | DF | TRANSCEIVERS {3} |
| 224 | DF | TESTING {4} |
| 229 | DF | EQUALIZERS {1} |
| 237 | DF | PULSE NUMBER MODULATION |
| 238 | DF | PULSE WIDTH MODULATION |
| 239 | DF | PULSE POSITION, FREQUENCY, OR SPACING MODULATION |
| 240 | DF | BANDWIDTH REDUCTION OR EXPANSION {1} |
| 242 | DF | PULSE CODE MODULATION {4} |
| 256 | DF | PULSE TRANSMISSION VIA RADIATED BASEBAND |
| 257 | DF | CABLE SYSTEMS AND COMPONENTS {1} |
| 259 | DF | SYSTEMS USING ALTERNATING OR PULSATING CURRENT {4} |
| 286 | DF | MULTILEVEL {6} |
| 295 | DF | TRANSMITTERS {6} |
| 316 | DF | RECEIVERS {9} |
| 353 | DF | PULSE AMPLITUDE MODULATION |
| 354 | DF | SYNCHRONIZERS {7} |
| 377 | DF | MISCELLANEOUS |