| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 11 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Basic communication technologies | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Magnets and transformers | |
| #2 | Tuning resonant circuits | |
| #3 | Unspecified technologies | |
| #4 | Capacitors and switching devices | |
| #5 | Unspecified technologies | |
| #6 | Resonators |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hammarlund Lloyd A | 5 |
| #2 | Randolph Scott Beverley | 3 |
| #3 | Ritzert Robert W | 1 |
| #4 | Oram Donald K | 1 |
| #5 | Whitaker James N | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2501853A | Station selector for radio apparatus | |
| US2388233A | Radio-frequency transmitter | |
| US2222043A | Selective wave transmission | |
| US1753182A | Variable coupling device | |
| US1719242A | Coil | |
| US1643998A | Method of making coils | |
| US1684917A | Adjustable condenser | |
| US1719241A | Coil construction | |
| US1604552A | Condenser | |
| US1596875A | Variable condenser | |
| US1501543A | Variable condenser |