| Ignition Battery | 357 |
| Ignition Switches | 383 |
| Ignition Switch Lever | 383 |
| Illuminated Porch Numbers | 468 |
| Improved Strain Insulators | 1339 |
| Incandescent Brackets | 770 |
| Incandescent Lamp Reflectors | 643 |
| Incandescent Lamps | 625 |
| Incandescent Light Attachments | 908 |
| Indicating Heater Receptacles | 931 |
| Indicating Plug Fuses | 1064 |
| Indicators, Excess | 309 |
| Indicators, High Speed | 1498 |
| Indicators, Tank | 565 |
| Indicators, Watt | 290 |
| Induction Coils | 100 |
| Inductive Fault Finders | 315, 323 |
| Industrial Clusters | 691 |
| Industrial Lighting | 691, 708 |
| Inner-Rope Pulleys | 779 |
| Inspection Lamps | 375 |
| Instrument Transformers | 311 |
| Insulated Brass Connectors | 1103 |
| Insulated Forks | 1414 |
| Insulated Staples | 1147 |
| Insulating and Splicing Links | 904 |
| Insulating Joints | 756 |
| Insulating Tapes | 803 |
| Insulating Varnish, Delta | 812 |
| Insulating Varnishes | 812, 823 |
| Insulation Pins | 1398 |
| Insulator Brackets, Ajax | 1402 |
| Insulator Clamps | 1366, 1369 |
| Insulator Pins | 1387 |
| Insulators and Cross Arms | 783 |
| |
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| Insulators, Electrose | 1359, 1363 |
| Insulators, Glass | 1345 |
| Insulators, High Voltage | 782 |
| Insulators, Jupiter | 782 |
| Insulators, Mine | 1339 |
| Insulators Pony Duplex | 1339 |
| Insulators Porcelain | 1338 |
| Insulators Safety Strain | 1359 |
| Insulators Strain | 1338 |
| Insulators Swinging | 782 |
| Insulators Tree | 782, 1402 |
| Interchangeable Plugs | 862 |
| Interchangeable Receptacles | 862 |
| Internal Elbows | 1073 |
| Inter-Phone Accessories | 71 |
| Inter-Phone Outfits | 67 |
| Inter-Phones, Apartment House | 59 |
| Inter-Phones, Hand Set Type | 43 |
| Inter-Phone Systems | 44, 64, 73 |
| Inter-Phone Systems, Introduction | 41, 53 |
| Iron Brackets | 1397, 1400 |
| Iron Drop Wire | 1313 |
| Iron Heaters, Curling | 602 |
| Iron Holders | 687 |
| Ironing Machines | 577 |
| Iron Pins | 1400 |
| Irons, Corner | 1390 |
| Irons, Curling | 613 |
| Irons, Electric | 595 |
| Irons, Ridge | 1371 |
| Irons, Soldering | 607, 612 |
| Iron Wire, Weatherproof | 1299 |
| Ivanhoe Fixtures | 688 |
| Ivanhoe Metal Reflectors | 798 |
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