Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6227235 | Temperature regulated hot water recirculation system | Johannes Nikolaus Laing | 2001-05-08 |
| 4869314 | Heat exchanger with secondary and tertiary heat exchange surface | Oliver Laing, Karsten Laing, Doerte Laing | 1989-09-26 |
| 4818193 | Centrifugal pump selectively mountable in centerline or inline position | Karsten Laing | 1989-04-04 |
| 4772184 | Piston pump for abrasive conveyances | Karsten Laing, Doerte Laing | 1988-09-20 |
| 4703748 | Destratifier for hot water tanks | Inge Laing, Oliver Laing, Karsten Laing | 1987-11-03 |
| 4682581 | Secondary circulation system | Karsten Laing, Doerte Laing | 1987-07-28 |