Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12273043 | Detection of ac input disconnection in an AC-DC converter section of a power converter | — | 2025-04-08 |
| 8653823 | Detection of welded switch contacts in a line converter system | Douglas Karraker, Ilkka T. Pajari, Matti T. Jussila | 2014-02-18 |
| 7948721 | AC motor bypass with fault annunciation, serial communication and fault tolerant coil control | Jeffrey A. Brunner, Douglas Karraker, Donald J. Truettner, Dennis Tyczkowski | 2011-05-24 |
| 6965290 | Low harmonic rectifier circuit | Alpo Vallinmaki, Nicklas Södö | 2005-11-15 |
| 6922883 | Method for making a non-linear inductor | Alpo Vallinmaki, Nicklas Södö | 2005-08-02 |
| 6774758 | Low harmonic rectifier circuit | Alpo Vallinmaki, Nicklas Södö | 2004-08-10 |
| 6741059 | Controller for a wound rotor slip ring induction machine | Douglas Karraker, Samuli Heikkila | 2004-05-25 |
| 6448735 | Controller for a wound rotor slip ring induction machine | Douglas Karraker, Samuli Heikkila | 2002-09-10 |
| 5672944 | Method and apparatus for minimizing torque ripple in a DC brushless motor using phase current overlap | Dennis L. Mueller | 1997-09-30 |
| 5560347 | Conductive foam vapor sensing | Sam R. Reddy | 1996-10-01 |
| 5404102 | Method and apparatus for electrically exciting a magneto-resistor device | Thaddeus Schroeder | 1995-04-04 |
| 5291133 | Multi-bit encoder signal conditioning circuit having common mode disturbance compensation | Thaddeus Schroeder | 1994-03-01 |
| 5264775 | Pulse width modulation control apparatus and method | Chandra S. Namuduri | 1993-11-23 |
| 5195496 | Ignition system having an electronic distributor | — | 1993-03-23 |
| 4998526 | Alternating current ignition system | — | 1991-03-12 |
| 4885493 | Output voltage control apparatus of a permanent magnet alternator | — | 1989-12-05 |
| 4835467 | Wheel speed sensor | — | 1989-05-30 |