Issued Patents All Time
Showing 1–23 of 23 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7553142 | Lubrication system for compressor | Stephen L. Shoulders | 2009-06-30 |
| 6814540 | Rotating vane diffuser for a centrifugal compressor | Vishnu M. Sishtla | 2004-11-09 |
| 6547520 | Rotating vane diffuser for a centrifugal compressor | James Barrett, Vishnu M. Sishtla | 2003-04-15 |
| 5927720 | Two-piece labyrinth seal for a centrifugal compressor balance piston | Paul W. Sweet | 1999-07-27 |
| 5899661 | Axial restraint system for variable pipe diffuser | Vishnu M. Sishtla | 1999-05-04 |
| 5404964 | System for reducing oil migration from a transmission | Vishnu M. Sishtla | 1995-04-11 |
| 5301771 | Oil channeling in a centrifugal compressor transmission | Vishnu M. Sishtla | 1994-04-12 |
| 5267452 | Back pressure valve | Vishnu M. Sishtla | 1993-12-07 |
| 5209080 | Refrigerant flow control device | — | 1993-05-11 |
| 5173020 | Collector silencer for a centrifugal compressor | Charles E. Ebbing, Edson H. Byrns | 1992-12-22 |
| 5009079 | Refrigerant flow control device | — | 1991-04-23 |
| 4997340 | Balance piston and seal arrangement | Vishnu M. Sishtla | 1991-03-05 |
| 4938664 | Oil reclaim system | — | 1990-07-03 |
| 4789317 | Rotary vane oil pump and method of operating | Max P. Waser | 1988-12-06 |
| 4611969 | Calibrating apparatus and method for a movable diffuser wall in a centrifugal compressor | — | 1986-09-16 |
| 4589060 | Microcomputer system for controlling the capacity of a refrigeration system | — | 1986-05-13 |
| 4539820 | Protective capacity control system for a refrigeration system | — | 1985-09-10 |
| 4531375 | Purge system monitor for a refrigeration system | — | 1985-07-30 |
| 4514991 | Variable speed drive motor system with inverter control | — | 1985-05-07 |
| 4404812 | Method and apparatus for controlling the operation of a centrifugal compressor in a refrigeration system | — | 1983-09-20 |
| 4309876 | Method and apparatus for satisfying heating and cooling demands and control therefor | Gary S. Leonard | 1982-01-12 |
| 4267705 | Refrigeration purging system | Gary S. Leonard | 1981-05-19 |
| 4254632 | Method and apparatus for satisfying heating and cooling demands and control therefor | Gary S. Leonard | 1981-03-10 |