Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8763424 | Subcooling heat exchanger adapted for evaporator distribution lines in a refrigeration circuit | — | 2014-07-01 |
| 7219503 | Quick-change coalescent oil separator | — | 2007-05-22 |
| 6952938 | Purge system and method of use | — | 2005-10-11 |
| 5768895 | Pressure relief system and method for a refrigerator system | Walter R. Key, Mark B. Key | 1998-06-23 |
| 5729991 | Pressure relief system for a refrigeration system | Walter R. Key, Mark B. Key | 1998-03-24 |
| 5722247 | Recovery system for very high-pressure refrigerants | Walter R. Key | 1998-03-03 |
| 5673563 | Pressure relief apparatus and method of use particularly for a refrigeration system | Walter R. Key, Mark B. Key | 1997-10-07 |
| 5644930 | Mechanical pressure relief valve having a variable position outlet | Walter R. Key, Mark B. Key | 1997-07-08 |
| 5577389 | Rupture disk fragment collection trap for refrigeration systems | Walter R. Key, Mark B. Key | 1996-11-26 |
| 5542261 | Refrigerant evaporator over-pressure relief system including a fluid containment vessel | Walter R. Key, Mark B. Key | 1996-08-06 |
| 5339647 | Portable apparatus for recovery of chlorofluorocarbon (CFC) refrigerants | Walter R. Key, Mark Stansbury | 1994-08-23 |
| 5241837 | Double pass purge system | — | 1993-09-07 |