Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6158515 | Artificial lifting device for well fluids using a continous loop | Richard H. Greer, Stephen B. Markwardt, Walter R. Shaw, John R. Watson | 2000-12-12 |
| D348512 | Ceiling fan motor housing | Michael A. Markwardt | 1994-07-05 |
| D322475 | Combined electric ceiling fan and light | Michael A. Markwardt | 1991-12-17 |
| D321933 | Combined electric ceiling fan and light or the like | Michael A. Markwardt | 1991-11-26 |
| 4878806 | Dual mounting ceiling fan | — | 1989-11-07 |
| 4729725 | Mounting system for selectively mounting ceiling fans | — | 1988-03-08 |