Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6125642 | Oil level control system | Joseph H. Heffner, Roger D. Chamberlain, David C. Macke, Sr., Richard Livingston | 2000-10-03 |
| 5524819 | Expansion and check valve combination | Joseph H. Heffner, Dennis L. Hoehne | 1996-06-11 |
| 5065595 | Thermostatic expansion valve | Joseph H. Heffner | 1991-11-19 |
| 4982578 | Refrigerant purge valve | Joseph H. Heffner | 1991-01-08 |
| 4964567 | Expansion and check valve combination | Joseph H. Heffner, Dennis L. Hoehne | 1990-10-23 |
| 4852364 | Expansion and check valve combination | Dennis L. Hoehne | 1989-08-01 |