Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7096681 | System and method for variable speed operation of a screw compressor | Harold Robert Schnetzka, Douglas A. Kester, John F. Judge, Mahesh Valiya-Naduvath, Israel Federman | 2006-08-29 |
| 7075268 | System and method for increasing output horsepower and efficiency in a motor | Harold Robert Schnetzka | 2006-07-11 |
| 6121749 | Variable-speed drive for single-phase motors | William L. Kopko | 2000-09-19 |
| 5898554 | Switch driver circuit | Harold Robert Schnetzka, Donald L. Tollinger | 1999-04-27 |
| 5838144 | Solid state, reduced voltage motor starter enabling equalized input/output volt-amp ratings | Harold Robert Schnetzka | 1998-11-17 |
| 5555736 | Refrigeration system and method | Dean K. Norbeck | 1996-09-17 |
| 5460009 | Refrigeration system and method | Dean K. Norbeck | 1995-10-24 |
| 5252905 | Driving system for single phase A-C induction motor | Jacob E. Shaffer, Jr. | 1993-10-12 |
| 5218283 | AC motor drive system with a two phase power supply | Harold Robert Schnetzka | 1993-06-08 |
| 5146147 | AC motor drive system | Harold Robert Schnetzka, Roy D. Hoffer | 1992-09-08 |
| 5136216 | AC motor drive system | Harold Robert Schnetzka, Roy D. Hoffer | 1992-08-04 |
| 5075838 | Energy efficient voltage snubber circuit | Harold Robert Schnetzka | 1991-12-24 |
| 4864487 | Control for three terminal power semiconductor devices | Harold Robert Schnetzka | 1989-09-05 |
| 4706180 | Pulse width modulated inverter system for driving single phase a-c induction motor | — | 1987-11-10 |
| 4651079 | Pulse width modulated inverter system for driving single phase a-c induction motor at a constant voltage/frequency ratio | — | 1987-03-17 |
| 4499534 | Control system for controlling an SCR network to regulate three-phase A-C power flow | Harold Robert Schnetzka, Dean K. Norbeck | 1985-02-12 |
| 4425539 | Control system for AC induction motor | — | 1984-01-10 |