Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5853572 | Home water purification system | Roy W. Kuennen, Robin M. Dykhouse, Dennis J. Kool, Ronald C. Markham, Bradley J. Pippel +1 more | 1998-12-29 |
| 5698091 | Home water purification system with filter end of life monitor | Roy W. Kuennen, Robin M. Dykhouse, Dennis J. Kool, Ronald C. Markham, Bradley J. Pippel +1 more | 1997-12-16 |
| 5536395 | Home water purification system with automatic disconnecting of radiant energy source | Roy W. Kuennen, Robin M. Dykhouse, Dennis J. Kool, Ronald C. Markham, Bradley J. Pippel +1 more | 1996-07-16 |
| 4319508 | Modular, expandable digital organ system | Harold O. Schwartz, William R. Hoskinson | 1982-03-16 |
| 4218949 | Master control LSI chip | Harold O. Schwartz | 1980-08-26 |
| 4203337 | Large scale integrated circuit chip for an electronic organ | Harold O. Schwartz | 1980-05-20 |