Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5381873 | Portable riser unit with a telescopic brace | John H. Kniefel, David R. Boeddeker | 1995-01-17 |
| 5357876 | Portable hinged riser | John H. Kniefel, Leslie R. Abraham, Frank C. Krumholz | 1994-10-25 |
| D330981 | Musical instrument digital interface desk | Leslie R. Abraham, Dennis R. Meyer, Craig J. Ulrich, Peter F. Menzel, Dorette E. Kanengieter | 1992-11-17 |
| 4796728 | Brake noise reduction system | David E. Stomberg | 1989-01-10 |
| 4345421 | Baling machine with a non-circular chamber | Terry R. Schwalenberg, Frank C. Krumholz, Larry L. Henkensiefken | 1982-08-24 |