Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6614607 | Servo pattern recording method and system | Stephen J. Rothermel, Robert P. Groschen, Jr., Curtis B. Hause, Richard E. Jewett | 2003-09-02 |
| 4775133 | Electric air valve | H. Kenneth Ring, Dennis L. Manthei | 1988-10-04 |
| 4749000 | Normally open pneumatic air valve | H. Kenneth Ring, Dennis L. Manthei | 1988-06-07 |
| 4749001 | Normally closed pneumatic air valve | H. Kenneth Ring, Dennis L. Manthei | 1988-06-07 |