| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 7 | |
| #2 | Canada | 4 |
| # | Industry | |
|---|---|---|
| #1 | Basic communication technologies | |
| #2 | Control | |
| #3 | Electrical machinery and energy | |
| #4 | Telecommunications | |
| #5 | Machines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Cromwell Gordon W | 3 |
| #2 | Borland Walter G | 3 |
| #3 | Jones Robert E | 2 |
| #4 | Borland W | 2 |
| #5 | Mcvey Eugene S | 2 |
| #6 | Cromwell G | 2 |
| #7 | Brugger Richard D | 1 |
| #8 | Brugger R | 1 |
| #9 | Fourspring N | 1 |
| #10 | Fourspring Neal B | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CA959119A | Apparatus for developing a regulated sinusoidal voltage | |
| US3778730A | Low harmonic telephone ringing generator | |
| US3763381A | Thyristor gating and phase shift circuit | |
| CA937651A | Bill trap | |
| US3569644A | Bill trap | |
| US3538426A | Series regulator with current limiter | |
| US3512044A | Over and under voltage protection circuit | |
| US3241046A | Programmed precision regulator | |
| US3241049A | Voltage regulator |