Class 381 ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES
| Printable Version[PDF] See notes regarding proper use of US-to-IPC Concordances. | ||
| U.S. Subclass | IPC8 Subclass | IPC8 Group |
|---|---|---|
| 1 | H 04 R | 5 / 00 |
| 2 | H 04 H | 20 / 47 |
| 2 | H 04 H | 20 / 88 |
| 2 | H 04 H | 40 / 36 |
| 3 - 14 | H 04 H | 20 / 48 |
| 3 | H 04 H | 40 / 45 |
| 4 - 10 | H 04 H | 40 / 54 |
| 11 | H 04 H | 40 / 81 |
| 12 | H 04 H | 40 / 54 |
| 13 | H 04 H | 40 / 72 |
| 15 - 16 | H 04 H | 20 / 49 |
| 17 - 23.1 | H 04 R | 5 / 00 |
| 23.1 | H 04 R | 25 / 00 |
| 26 - 28 | H 04 R | 5 / 00 |
| 54 | G 10 L | 21 / 00 |
| 55 | H 03 G | 11 / 00 |
| 56 | H 04 R | 29 / 00 |
| 57 | H 03 G | 3 / 20 |
| 58 - 60 | H 04 R | 29 / 00 |
| 61 - 65 | H 03 G | 3 / 00 |
| 66 | H 04 B | 3 / 20 |
| 67 | A 61 B | 7 / 04 |
| 70 | A 61 F | 2 / 20 |
| 71.1 - 72 | A 61 F | 11 / 06 |
| 71.1 - 71.9 | G 10 K | 11 / 16 |
| 71.1 - 71.9 | H 03 B | 29 / 00 |
| 73.1 | H 04 R | 3 / 02 |
| 74 | H 04 R | 1 / 10 |
| 75 | H 04 R | 27 / 04 |
| 76 | H 04 R | 27 / 00 |
| 77 - 78 | H 04 B | 3 / 00 |
| 79 | H 04 B | 5 / 00 |
| 80 - 81 | H 04 B | 3 / 00 |
| 82 - 85 | H 04 R | 27 / 00 |
| 86 | H 04 B | 1 / 00 |
| 87 | H 04 R | 1 / 02 |
| 89 | H 04 R | 1 / 02 |
| 91 | H 04 R | 1 / 02 |
| 92 | H 04 R | 3 / 00 |
| 93 | H 04 B | 15 / 00 |
| 94.1 - 94.9 | H 04 B | 15 / 00 |
| 95 - 96 | H 04 R | 3 / 00 |
| 97 | H 04 R | 1 / 40 |
| 98 - 101 | H 03 G | 5 / 00 |
| 102 | H 03 G | 9 / 00 |
| 103 | H 03 G | 5 / 00 |
| 104 - 105 | H 03 G | 3 / 00 |
| 106 | H 03 G | 7 / 00 |
| 107 - 109 | H 03 G | 3 / 00 |
| 110 | H 03 G | 3 / 20 |
| 110 - 117 | H 04 R | 3 / 00 |
| 118 | G 10 H | 1 / 00 |
| 119 | H 04 B | 1 / 00 |
| 120 - 121 | H 03 F | 99 / 00 |
| 122 | H 04 R | 3 / 00 |
| 123 | H 02 B | 1 / 00 |
| 124 | G 09 F | 27 / 00 |
| 150 - 152 | H 04 R | 25 / 00 |
| 160 - 167 | H 04 R | 25 / 00 |
| 170 - 182 | H 04 R | 25 / 00 |
| 184 - 186 | H 04 R | 25 / 00 |
| 189 - 191 | H 04 R | 25 / 00 |
| 300 - 311 | H 04 R | 5 / 02 |
| 312 - 331 | H 04 R | 25 / 00 |
| 332 - 354 | H 04 R | 1 / 02 |
| 332 - 336 | H 04 R | 9 / 06 |
| 337 - 354 | H 04 R | 1 / 20 |
| 355 - 369 | H 04 R | 9 / 08 |
| 355 - 369 | H 04 R | 11 / 04 |
| 355 - 369 | H 04 R | 17 / 02 |
| 355 - 369 | H 04 R | 19 / 04 |
| 355 - 369 | H 04 R | 21 / 02 |
| 370 - 384 | H 04 R | 25 / 00 |
| 385 | H 04 R | 1 / 00 |
| 386 - 395 | H 04 R | 1 / 02 |
| 396 - 433 | H 04 R | 1 / 00 |
| 396 - 433 | H 04 R | 9 / 06 |
| 396 - 433 | H 04 R | 11 / 02 |