Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5826650 | Devices and methods for utilization of intermittently available electric energy for heating and cooling of habitable structures | Leonard J. Keller, by Lina Mae Maddox, executor | 1998-10-27 |
| 5134944 | Processes and means for waste resources utilization | Leonard J. Keller | 1992-08-04 |
| 4953479 | Methacoal integrated combined cycle power plants | Leonard J. Keller | 1990-09-04 |
| 4742784 | Methods for reducing nitrogen oxides emissions from power plants fired by various coals | Leonard J. Keller | 1988-05-10 |
| 4573651 | Torque orientation device | — | 1986-03-04 |
| 4541357 | Watercraft having water jet lift | — | 1985-09-17 |
| 4526225 | Building element for heat storage and transfer | — | 1985-07-02 |
| 4449018 | Hearing aid | — | 1984-05-15 |
| 4418656 | Rotary motion transformer | — | 1983-12-06 |
| 4322744 | Virtual sound system for the visually handicapped | — | 1982-03-30 |