| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 15 | |
| #2 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Machines | |
| #3 | Telecommunications | |
| #4 | Packaging and shipping |
| # | Technology | |
|---|---|---|
| #1 | Magnets and transformers | |
| #2 | Unspecified technologies | |
| #3 | Electrically-conductive connections | |
| #4 | Unspecified technologies | |
| #5 | Handling thin material | |
| #6 | Transmission |
| # | Name | Total Patents |
|---|---|---|
| #1 | Arni Helgason | 10 |
| #2 | Leidy Wilmer J | 6 |
| #3 | Keegan Peter E | 3 |
| #4 | Nick Knuth | 2 |
| #5 | Helgason Arni | 1 |
| #6 | Glenn Koehler | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2307319A | Testing circuit | |
| US2236316A | Induction coil | |
| US2166841A | Coil | |
| US2078331A | Transformer | |
| US2072635A | Terminal board | |
| US2053339A | Transformer casing | |
| US2007681A | Transformer casing | |
| US1988734A | Transformer | |
| US1988733A | Transformer | |
| US1906586A | Transformer construction | |
| US1964946A | Apparatus for making stepped coils | |
| US1964945A | Transformer installation | |
| US1868667A | Coil winding machine | |
| US1799790A | Transformer shield or casing | |
| US1833221A | Electrostatically shielded transformer coil windings and method of making the same | |
| CA352177A | Stepped coil making apparatus |