Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8045303 | Building service ground fault interrupter | Fred von Herrmann | 2011-10-25 |
| 7697255 | Dissipator | Frederick Howell Von Herrmann | 2010-04-13 |
| 7595669 | Method and apparatus for producing clean, undistorted variable voltage 50-60 Hz sine wave | Frederick Howell Von Herrmann | 2009-09-29 |
| 5019805 | Smoke detector with strobed visual alarm and remote alarm coupling | Lowell E. Roberts | 1991-05-28 |
| 4999728 | Power surge protection circuit | — | 1991-03-12 |
| 4695880 | Electronic information dissemination system | Terry William Johnson, Daryl Harms | 1987-09-22 |