Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8310113 | Multiple armature linear motor/alternator having magnetic spring with no fringe fields and increased power output | — | 2012-11-13 |
| 7409833 | Dual mode compressor with automatic compression ratio adjustment for adapting to multiple operating conditions | Joshua Collins | 2008-08-12 |
| 7210312 | Energy efficient, inexpensive extraction of oxygen from ambient air for portable and home use | — | 2007-05-01 |
| 6993917 | Coupling for heat transfer member | Dong Hwang, Woo-Suk Chung | 2006-02-07 |
| 6880452 | Spring standoff for a reciprocating device | Robert B. Wiseman, David E. Weeks, Floyd Largent, Woo-Suk Chung | 2005-04-19 |
| 6782700 | Transient temperature control system and method for preventing destructive collisions in free piston machines | Ezekiel S. Holliday | 2004-08-31 |
| 6536326 | Control system and method for preventing destructive collisions in free piston machines | Nicholas van der Walt, Douglas E. Keiter | 2003-03-25 |
| 6446336 | Heat exchanger and method of constructing same | — | 2002-09-10 |
| 6293184 | Gas bearing and method of making a gas bearing for a free piston machine | — | 2001-09-25 |
| 6199381 | DC centering of free piston machine | Douglas E. Keiter | 2001-03-13 |
| 6038874 | Refrigeration circuit having series evaporators and modulatable compressor | Nicholas van der Walt | 2000-03-21 |
| 5715693 | Refrigeration circuit having series evaporators and modulatable compressor | Nicholas van der Walt | 1998-02-10 |
| 5642088 | Magnet support sleeve for linear electromechanical transducer | — | 1997-06-24 |
| 5537820 | Free piston end position limiter | William T. Beale, Nicholas van der Walt | 1996-07-23 |
| 5525845 | Fluid bearing with compliant linkage for centering reciprocating bodies | William T. Beale, Nicholas van der Walt | 1996-06-11 |