US Patent Class 455
TELECOMMUNICATIONS-- 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 | ||
| 1 | DF | INTERFERENCE SIGNAL TRANSMISSION (E.G., JAMMING) |
| 2 | DF | AUDIENCE SURVEY OR PROGRAM DISTRIBUTION USE ACCOUNTING |
| 3.1 | DF | DISTRIBUTION SYSTEM (E.G., PLURAL CABLES, ETC.) {6} |
| 400 | DF | HAVING SINGLE-CHANNEL TELEPHONE CARRIER {2} |
| 403 | DF | RADIOTELEPHONE SYSTEM {12} |
| 7 | DF | CARRIER WAVE REPEATER OR RELAY SYSTEM (I.E., RETRANSMISSION OF SAME INFORMATION) {12} |
| 26.1 | DF | USE OR ACCESS BLOCKING (E.G., LOCKING SWITCH) |
| 31.1 | DF | SYSTEM WITH RECEIVER SELECTION {4} |
| 39 | DF | TRANSMITTER AND RECEIVER AT SEPARATE STATIONS {14} |
| 73 | DF | TRANSMITTER AND RECEIVER AT SAME STATION (E.G., TRANSCEIVER) {9} |
| 91 | DF | TRANSMITTER {22} |
| 130 | DF | RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24} |
| 899 | DF | MISCELLANEOUS {5} |
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| FOREIGN ART COLLECTIONS | ||
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