Issued Patents All Time
Showing 25 most recent of 57 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7032395 | Transport temperature control unit and methods of defrosting an evaporator coil of the same | Steven Bruce Helgeson | 2006-04-25 |
| 6871629 | Refrigeration system with low-fuel shutdown | Thomas R. Sem, Steve Brenneman, Ricardo Spiro DeGrego | 2005-03-29 |
| 6829523 | Method and apparatus for controlling a transport temperature control unit having selectively programmable temperature ranges | — | 2004-12-07 |
| 6708507 | Temperature control apparatus and method of determining malfunction | Thomas R. Sem | 2004-03-23 |
| 6679074 | Automatic switching refrigeration system | — | 2004-01-20 |
| 6609388 | Method of defrosting an evaporator coil of a transport temperature control unit | — | 2003-08-26 |
| 6367269 | Electronic throttling valve diagnosis and preventative shutdown control | Steven Bruce Helgeson | 2002-04-09 |
| 6037864 | Method for continuously determining the oil change interval for an internal combustion engine | Thomas R. Sem | 2000-03-14 |
| RE36437 | System and method of monitoring a vehicle and/or for controlling the temperature of an interior portion of the vehicle | Loran Sutton, Donald G. Knauff | 1999-12-14 |
| 5977647 | Automatic pretrip for engine powered generator | Douglas E. Lenz, Ladislaus Joseph Brabec, Dave Forsmark, Mike P. Gaynor, Doyle G. Herrig +1 more | 1999-11-02 |
| 5778690 | Method for continuously running a multi-temp refrigeration circuit at a high compressor speed | Steven Bruce Helgeson, Stanley O. Hoium | 1998-07-14 |
| 5634347 | Method of controlling a transport refrigeration system without refrigerant modulation | Doyle G. Herrig | 1997-06-03 |
| 5596878 | Methods and apparatus for operating a refrigeration unit | James E. Nixon, Stanley O. Hoium, Peter W. Freund | 1997-01-28 |
| 5579648 | Method of monitoring a transport refrigeration unit and an associated conditioned load | Doyle G. Herrig | 1996-12-03 |
| 5564285 | Method of converting a time based data logger to a time and random event based data logger | Romuald M. Jurewicz, James E. Nixon, Albert Wong, Doyle G. Herrig | 1996-10-15 |
| 5557938 | Transport refrigeration unit and method of operating same | Doyle G. Herrig | 1996-09-24 |
| 5557941 | Refrigeration unit and method of operating same | James E. Nixon, Doyle G. Herrig, Gerald J. Ladendorf | 1996-09-24 |
| 5530647 | Method of dynamically determining oil change intervals for internal combustion engines | Thomas R. Sem, Doyle G. Herrig | 1996-06-25 |
| 5456088 | Refrigeration unit and method of operating same | James E. Nixon, Doyle G. Herrig, Gerald J. Ladendorf | 1995-10-10 |
| 5454229 | Refrigeration unit control with shutdown evaluation and automatic restart | Doyle G. Herrig, Stanley O. Hoium, James M. Roush, James E. Nixon | 1995-10-03 |
| 5369957 | Method and apparatus for checking the position and condition of a temperature sensor in a refrigeration system | — | 1994-12-06 |
| 5331821 | Method of starting and running an internal combustion engine connected to a refrigerant compressor | Doyle G. Herrig, James E. Nixon, Gerald J. Ladendorf, Lowell B. Naley, Norman F. Spear | 1994-07-26 |
| 5317998 | Method of monitoring a truck engine and for controlling the temperature of a truck sleeper unit | Loran Sutton, Donald G. Knauff | 1994-06-07 |
| 5303560 | Method and apparatus for monitoring and controlling the operation of a refrigeration unit | Doyle G. Herrig | 1994-04-19 |
| 5291745 | Method of improving temperature uniformity of a space conditioned by a refrigeration unit | — | 1994-03-08 |